2/* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $ */
3
4/*-
5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
7 * All rights reserved.
8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by TooLs GmbH.
21 * 4. The name of TooLs GmbH may not be used to endorse or promote products
22 * derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35/*
36 * Written by Paul Popelka (paulp@uts.amdahl.com)
37 *
38 * You can do anything you want with this software, just don't say you wrote
39 * it, and don't remove this notice.
40 *
41 * This software is provided "as is".
42 *
43 * The author supplies this software to be publicly redistributed on the
44 * understanding that the author is not responsible for the correct
45 * functioning of this software in any circumstances and is not liable for
46 * any damages caused by this software.
47 *
48 * October 1992
49 */
50
51#include <sys/param.h>
52#include <sys/systm.h>
53#include <sys/namei.h>
54#include <sys/resourcevar.h> /* defines plimit structure in proc struct */
55#include <sys/kernel.h>
56#include <sys/stat.h>
57#include <sys/buf.h>
58#include <sys/proc.h>
59#include <sys/mount.h>
60#include <sys/unistd.h>
61#include <sys/vnode.h>
62#include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */
63#include <sys/malloc.h>
64#include <sys/dirent.h>
65#include <sys/signalvar.h>
66
67#include <vm/vm.h>
68#include <vm/vm_extern.h>
69#include <vm/vm_zone.h>
70#include <vm/vnode_pager.h>
71
72#include <msdosfs/bpb.h>
73#include <msdosfs/direntry.h>
74#include <msdosfs/denode.h>
75#include <msdosfs/msdosfsmount.h>
76#include <msdosfs/fat.h>
77
78/*
79 * Prototypes for MSDOSFS vnode operations
80 */
81static int msdosfs_create __P((struct vop_create_args *));
82static int msdosfs_mknod __P((struct vop_mknod_args *));
83static int msdosfs_close __P((struct vop_close_args *));
84static int msdosfs_access __P((struct vop_access_args *));
85static int msdosfs_getattr __P((struct vop_getattr_args *));
86static int msdosfs_setattr __P((struct vop_setattr_args *));
87static int msdosfs_read __P((struct vop_read_args *));
88static int msdosfs_write __P((struct vop_write_args *));
89static int msdosfs_fsync __P((struct vop_fsync_args *));
90static int msdosfs_remove __P((struct vop_remove_args *));
91static int msdosfs_link __P((struct vop_link_args *));
92static int msdosfs_rename __P((struct vop_rename_args *));
93static int msdosfs_mkdir __P((struct vop_mkdir_args *));
94static int msdosfs_rmdir __P((struct vop_rmdir_args *));
95static int msdosfs_symlink __P((struct vop_symlink_args *));
96static int msdosfs_readdir __P((struct vop_readdir_args *));
97static int msdosfs_abortop __P((struct vop_abortop_args *));
98static int msdosfs_bmap __P((struct vop_bmap_args *));
99static int msdosfs_strategy __P((struct vop_strategy_args *));
100static int msdosfs_print __P((struct vop_print_args *));
101static int msdosfs_pathconf __P((struct vop_pathconf_args *ap));
102static int msdosfs_getpages __P((struct vop_getpages_args *));
103static int msdosfs_putpages __P((struct vop_putpages_args *));
104
105/*
106 * Some general notes:
107 *
108 * In the ufs filesystem the inodes, superblocks, and indirect blocks are
109 * read/written using the vnode for the filesystem. Blocks that represent
110 * the contents of a file are read/written using the vnode for the file
111 * (including directories when they are read/written as files). This
112 * presents problems for the dos filesystem because data that should be in
113 * an inode (if dos had them) resides in the directory itself. Since we
114 * must update directory entries without the benefit of having the vnode
115 * for the directory we must use the vnode for the filesystem. This means
116 * that when a directory is actually read/written (via read, write, or
117 * readdir, or seek) we must use the vnode for the filesystem instead of
118 * the vnode for the directory as would happen in ufs. This is to insure we
119 * retreive the correct block from the buffer cache since the hash value is
120 * based upon the vnode address and the desired block number.
121 */
122
123/*
124 * Create a regular file. On entry the directory to contain the file being
125 * created is locked. We must release before we return. We must also free
126 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or
127 * only if the SAVESTART bit in cn_flags is clear on success.
128 */
129static int
130msdosfs_create(ap)
131 struct vop_create_args /* {
132 struct vnode *a_dvp;
133 struct vnode **a_vpp;
134 struct componentname *a_cnp;
135 struct vattr *a_vap;
136 } */ *ap;
137{
138 struct componentname *cnp = ap->a_cnp;
139 struct denode ndirent;
140 struct denode *dep;
141 struct denode *pdep = VTODE(ap->a_dvp);
142 struct timespec ts;
143 int error;
144
145#ifdef MSDOSFS_DEBUG
146 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap);
147#endif
148
149 /*
150 * If this is the root directory and there is no space left we
151 * can't do anything. This is because the root directory can not
152 * change size.
153 */
154 if (pdep->de_StartCluster == MSDOSFSROOT
155 && pdep->de_fndoffset >= pdep->de_FileSize) {
156 error = ENOSPC;
157 goto bad;
158 }
159
160 /*
161 * Create a directory entry for the file, then call createde() to
162 * have it installed. NOTE: DOS files are always executable. We
163 * use the absence of the owner write bit to make the file
164 * readonly.
165 */
166#ifdef DIAGNOSTIC
167 if ((cnp->cn_flags & HASBUF) == 0)
168 panic("msdosfs_create: no name");
169#endif
170 bzero(&ndirent, sizeof(ndirent));
171 error = uniqdosname(pdep, cnp, ndirent.de_Name);
172 if (error)
173 goto bad;
174
175 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ?
176 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY;
177 ndirent.de_LowerCase = 0;
178 ndirent.de_StartCluster = 0;
179 ndirent.de_FileSize = 0;
180 ndirent.de_dev = pdep->de_dev;
181 ndirent.de_devvp = pdep->de_devvp;
182 ndirent.de_pmp = pdep->de_pmp;
183 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
184 getnanotime(&ts);
185 DETIMES(&ndirent, &ts, &ts, &ts);
186 error = createde(&ndirent, pdep, &dep, cnp);
187 if (error)
188 goto bad;
189 if ((cnp->cn_flags & SAVESTART) == 0)
190 zfree(namei_zone, cnp->cn_pnbuf);
191 *ap->a_vpp = DETOV(dep);
192 return (0);
193
194bad:
195 zfree(namei_zone, cnp->cn_pnbuf);
196 return (error);
197}
198
199static int
200msdosfs_mknod(ap)
201 struct vop_mknod_args /* {
202 struct vnode *a_dvp;
203 struct vnode **a_vpp;
204 struct componentname *a_cnp;
205 struct vattr *a_vap;
206 } */ *ap;
207{
208
209 switch (ap->a_vap->va_type) {
210 case VDIR:
211 return (msdosfs_mkdir((struct vop_mkdir_args *)ap));
212 break;
213
214 case VREG:
215 return (msdosfs_create((struct vop_create_args *)ap));
216 break;
217
218 default:
219 zfree(namei_zone, ap->a_cnp->cn_pnbuf);
220 return (EINVAL);
221 }
222 /* NOTREACHED */
223}
224
225static int
226msdosfs_close(ap)
227 struct vop_close_args /* {
228 struct vnode *a_vp;
229 int a_fflag;
230 struct ucred *a_cred;
231 struct proc *a_p;
232 } */ *ap;
233{
234 struct vnode *vp = ap->a_vp;
235 struct denode *dep = VTODE(vp);
236 struct timespec ts;
237
238 simple_lock(&vp->v_interlock);
239 if (vp->v_usecount > 1) {
240 getnanotime(&ts);
241 DETIMES(dep, &ts, &ts, &ts);
242 }
243 simple_unlock(&vp->v_interlock);
244 return 0;
245}
246
247static int
248msdosfs_access(ap)
249 struct vop_access_args /* {
250 struct vnode *a_vp;
251 int a_mode;
252 struct ucred *a_cred;
253 struct proc *a_p;
254 } */ *ap;
255{
256 struct vnode *vp = ap->a_vp;
257 struct denode *dep = VTODE(ap->a_vp);
258 struct msdosfsmount *pmp = dep->de_pmp;
259 struct ucred *cred = ap->a_cred;
260 mode_t mask, file_mode, mode = ap->a_mode;
261 register gid_t *gp;
262 int i;
263
264 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) |
265 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH));
266 file_mode &= pmp->pm_mask;
267
268 /*
269 * Disallow write attempts on read-only file systems;
270 * unless the file is a socket, fifo, or a block or
271 * character device resident on the file system.
272 */
273 if (mode & VWRITE) {
274 switch (vp->v_type) {
275 case VDIR:
276 case VLNK:
277 case VREG:
278 if (vp->v_mount->mnt_flag & MNT_RDONLY)
279 return (EROFS);
280 break;
281 default:
282 break;
283 }
284 }
285
286 /* User id 0 always gets access. */
287 if (cred->cr_uid == 0)
288 return 0;
289
290 mask = 0;
291
292 /* Otherwise, check the owner. */
293 if (cred->cr_uid == pmp->pm_uid) {
294 if (mode & VEXEC)
295 mask |= S_IXUSR;
296 if (mode & VREAD)
297 mask |= S_IRUSR;
298 if (mode & VWRITE)
299 mask |= S_IWUSR;
300 return (file_mode & mask) == mask ? 0 : EACCES;
301 }
302
303 /* Otherwise, check the groups. */
304 for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
305 if (pmp->pm_gid == *gp) {
306 if (mode & VEXEC)
307 mask |= S_IXGRP;
308 if (mode & VREAD)
309 mask |= S_IRGRP;
310 if (mode & VWRITE)
311 mask |= S_IWGRP;
312 return (file_mode & mask) == mask ? 0 : EACCES;
313 }
314
315 /* Otherwise, check everyone else. */
316 if (mode & VEXEC)
317 mask |= S_IXOTH;
318 if (mode & VREAD)
319 mask |= S_IROTH;
320 if (mode & VWRITE)
321 mask |= S_IWOTH;
322 return (file_mode & mask) == mask ? 0 : EACCES;
323}
324
325static int
326msdosfs_getattr(ap)
327 struct vop_getattr_args /* {
328 struct vnode *a_vp;
329 struct vattr *a_vap;
330 struct ucred *a_cred;
331 struct proc *a_p;
332 } */ *ap;
333{
334 struct denode *dep = VTODE(ap->a_vp);
335 struct msdosfsmount *pmp = dep->de_pmp;
336 struct vattr *vap = ap->a_vap;
337 mode_t mode;
338 struct timespec ts;
339 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
340 u_long fileid;
341
342 getnanotime(&ts);
343 DETIMES(dep, &ts, &ts, &ts);
344 vap->va_fsid = dep->de_dev;
345 /*
346 * The following computation of the fileid must be the same as that
347 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
348 * doesn't work.
349 */
350 if (dep->de_Attributes & ATTR_DIRECTORY) {
351 fileid = cntobn(pmp, dep->de_StartCluster) * dirsperblk;
352 if (dep->de_StartCluster == MSDOSFSROOT)
353 fileid = 1;
354 } else {
355 fileid = cntobn(pmp, dep->de_dirclust) * dirsperblk;
356 if (dep->de_dirclust == MSDOSFSROOT)
357 fileid = roottobn(pmp, 0) * dirsperblk;
358 fileid += dep->de_diroffset / sizeof(struct direntry);
359 }
360 vap->va_fileid = fileid;
361 if ((dep->de_Attributes & ATTR_READONLY) == 0)
362 mode = S_IRWXU|S_IRWXG|S_IRWXO;
363 else
364 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
365 vap->va_mode = mode & pmp->pm_mask;
366 vap->va_uid = pmp->pm_uid;
367 vap->va_gid = pmp->pm_gid;
368 vap->va_nlink = 1;
369 vap->va_rdev = 0;
370 vap->va_size = dep->de_FileSize;
371 dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime);
372 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
373 dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime);
374 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, &vap->va_ctime);
375 } else {
376 vap->va_atime = vap->va_mtime;
377 vap->va_ctime = vap->va_mtime;
378 }
379 vap->va_flags = 0;
380 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0)
381 vap->va_flags |= SF_ARCHIVED;
382 vap->va_gen = 0;
383 vap->va_blocksize = pmp->pm_bpcluster;
384 vap->va_bytes =
385 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
386 vap->va_type = ap->a_vp->v_type;
387 vap->va_filerev = dep->de_modrev;
388 return (0);
389}
390
391static int
392msdosfs_setattr(ap)
393 struct vop_setattr_args /* {
394 struct vnode *a_vp;
395 struct vattr *a_vap;
396 struct ucred *a_cred;
397 struct proc *a_p;
398 } */ *ap;
399{
400 struct vnode *vp = ap->a_vp;
401 struct denode *dep = VTODE(ap->a_vp);
402 struct msdosfsmount *pmp = dep->de_pmp;
403 struct vattr *vap = ap->a_vap;
404 struct ucred *cred = ap->a_cred;
405 int error = 0;
406
407#ifdef MSDOSFS_DEBUG
408 printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n",
409 ap->a_vp, vap, cred, ap->a_p);
410#endif
411
412 /*
413 * Check for unsettable attributes.
414 */
415 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
416 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
417 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
418 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
419#ifdef MSDOSFS_DEBUG
420 printf("msdosfs_setattr(): returning EINVAL\n");
421 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n",
422 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid);
423 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n",
424 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen);
425 printf(" va_uid %x, va_gid %x\n",
426 vap->va_uid, vap->va_gid);
427#endif
428 return (EINVAL);
429 }
430 if (vap->va_flags != VNOVAL) {
431 if (vp->v_mount->mnt_flag & MNT_RDONLY)
432 return (EROFS);
433 if (cred->cr_uid != pmp->pm_uid &&
434 (error = suser_xxx(cred, ap->a_p, PRISON_ROOT)))
435 return (error);
436 /*
437 * We are very inconsistent about handling unsupported
438 * attributes. We ignored the access time and the
439 * read and execute bits. We were strict for the other
440 * attributes.
441 *
442 * Here we are strict, stricter than ufs in not allowing
443 * users to attempt to set SF_SETTABLE bits or anyone to
444 * set unsupported bits. However, we ignore attempts to
445 * set ATTR_ARCHIVE for directories `cp -pr' from a more
446 * sensible file system attempts it a lot.
447 */
448 if (cred->cr_uid != 0) {
449 if (vap->va_flags & SF_SETTABLE)
450 return EPERM;
451 }
452 if (vap->va_flags & ~SF_ARCHIVED)
453 return EOPNOTSUPP;
454 if (vap->va_flags & SF_ARCHIVED)
455 dep->de_Attributes &= ~ATTR_ARCHIVE;
456 else if (!(dep->de_Attributes & ATTR_DIRECTORY))
457 dep->de_Attributes |= ATTR_ARCHIVE;
458 dep->de_flag |= DE_MODIFIED;
459 }
460
461 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
462 uid_t uid;
463 gid_t gid;
464
465 if (vp->v_mount->mnt_flag & MNT_RDONLY)
466 return (EROFS);
467 uid = vap->va_uid;
468 if (uid == (uid_t)VNOVAL)
469 uid = pmp->pm_uid;
470 gid = vap->va_gid;
471 if (gid == (gid_t)VNOVAL)
472 gid = pmp->pm_gid;
473 if ((cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid ||
474 (gid != pmp->pm_gid && !groupmember(gid, cred))) &&
475 (error = suser_xxx(cred, ap->a_p, PRISON_ROOT)))
476 return error;
477 if (uid != pmp->pm_uid || gid != pmp->pm_gid)
478 return EINVAL;
479 }
480
481 if (vap->va_size != VNOVAL) {
482 /*
483 * Disallow write attempts on read-only file systems;
484 * unless the file is a socket, fifo, or a block or
485 * character device resident on the file system.
486 */
487 switch (vp->v_type) {
488 case VDIR:
489 return (EISDIR);
490 /* NOT REACHED */
491 case VLNK:
492 case VREG:
493 if (vp->v_mount->mnt_flag & MNT_RDONLY)
494 return (EROFS);
495 break;
496 default:
497 break;
498 }
499 error = detrunc(dep, vap->va_size, 0, cred, ap->a_p);
500 if (error)
501 return error;
502 }
503 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
504 if (vp->v_mount->mnt_flag & MNT_RDONLY)
505 return (EROFS);
506 if (cred->cr_uid != pmp->pm_uid &&
507 (error = suser_xxx(cred, ap->a_p, PRISON_ROOT)) &&
508 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
509 (error = VOP_ACCESS(ap->a_vp, VWRITE, cred, ap->a_p))))
510 return (error);
511 if (vp->v_type != VDIR) {
512 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 &&
513 vap->va_atime.tv_sec != VNOVAL)
514 unix2dostime(&vap->va_atime, &dep->de_ADate, NULL, NULL);
515 if (vap->va_mtime.tv_sec != VNOVAL)
516 unix2dostime(&vap->va_mtime, &dep->de_MDate, &dep->de_MTime, NULL);
517 dep->de_Attributes |= ATTR_ARCHIVE;
518 dep->de_flag |= DE_MODIFIED;
519 }
520 }
521 /*
522 * DOS files only have the ability to have their writability
523 * attribute set, so we use the owner write bit to set the readonly
524 * attribute.
525 */
526 if (vap->va_mode != (mode_t)VNOVAL) {
527 if (vp->v_mount->mnt_flag & MNT_RDONLY)
528 return (EROFS);
529 if (cred->cr_uid != pmp->pm_uid &&
530 (error = suser_xxx(cred, ap->a_p, PRISON_ROOT)))
531 return (error);
532 if (vp->v_type != VDIR) {
533 /* We ignore the read and execute bits. */
534 if (vap->va_mode & VWRITE)
535 dep->de_Attributes &= ~ATTR_READONLY;
536 else
537 dep->de_Attributes |= ATTR_READONLY;
538 dep->de_flag |= DE_MODIFIED;
539 }
540 }
541 return (deupdat(dep, 1));
542}
543
544static int
545msdosfs_read(ap)
546 struct vop_read_args /* {
547 struct vnode *a_vp;
548 struct uio *a_uio;
549 int a_ioflag;
550 struct ucred *a_cred;
551 } */ *ap;
552{
553 int error = 0;
554 int diff;
555 int blsize;
556 int isadir;
557 long n;
558 long on;
559 daddr_t lbn;
560 daddr_t rablock;
561 int rasize;
562 struct buf *bp;
563 struct vnode *vp = ap->a_vp;
564 struct denode *dep = VTODE(vp);
565 struct msdosfsmount *pmp = dep->de_pmp;
566 struct uio *uio = ap->a_uio;
567
568 /*
569 * If they didn't ask for any data, then we are done.
570 */
571 if (uio->uio_resid == 0)
572 return (0);
573 if (uio->uio_offset < 0)
574 return (EINVAL);
575
576 isadir = dep->de_Attributes & ATTR_DIRECTORY;
577 do {
578 lbn = de_cluster(pmp, uio->uio_offset);
579 on = uio->uio_offset & pmp->pm_crbomask;
580 n = min((u_long) (pmp->pm_bpcluster - on), uio->uio_resid);
581 diff = dep->de_FileSize - uio->uio_offset;
582 if (diff <= 0)
583 return (0);
584 if (diff < n)
585 n = diff;
586 /* convert cluster # to block # if a directory */
587 if (isadir) {
588 error = pcbmap(dep, lbn, &lbn, 0, &blsize);
589 if (error)
590 return (error);
591 }
592 /*
593 * If we are operating on a directory file then be sure to
594 * do i/o with the vnode for the filesystem instead of the
595 * vnode for the directory.
596 */
597 if (isadir) {
598 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp);
599 } else {
600 rablock = lbn + 1;
601 if (vp->v_lastr + 1 == lbn &&
602 de_cn2off(pmp, rablock) < dep->de_FileSize) {
603 rasize = pmp->pm_bpcluster;
604 error = breadn(vp, lbn, pmp->pm_bpcluster,
605 &rablock, &rasize, 1, NOCRED, &bp);
606 } else
607 error = bread(vp, lbn, pmp->pm_bpcluster,
608 NOCRED, &bp);
609 vp->v_lastr = lbn;
610 }
611 n = min(n, pmp->pm_bpcluster - bp->b_resid);
612 if (error) {
613 brelse(bp);
614 return (error);
615 }
616 error = uiomove(bp->b_data + on, (int) n, uio);
617 brelse(bp);
618 } while (error == 0 && uio->uio_resid > 0 && n != 0);
619 if (!isadir && !(vp->v_mount->mnt_flag & MNT_NOATIME))
620 dep->de_flag |= DE_ACCESS;
621 return (error);
622}
623
624/*
625 * Write data to a file or directory.
626 */
627static int
628msdosfs_write(ap)
629 struct vop_write_args /* {
630 struct vnode *a_vp;
631 struct uio *a_uio;
632 int a_ioflag;
633 struct ucred *a_cred;
634 } */ *ap;
635{
636 int n;
637 int croffset;
638 int resid;
639 u_long osize;
640 int error = 0;
641 u_long count;
642 daddr_t bn, lastcn;
643 struct buf *bp;
644 int ioflag = ap->a_ioflag;
645 struct uio *uio = ap->a_uio;
646 struct proc *p = uio->uio_procp;
647 struct vnode *vp = ap->a_vp;
648 struct vnode *thisvp;
649 struct denode *dep = VTODE(vp);
650 struct msdosfsmount *pmp = dep->de_pmp;
651 struct ucred *cred = ap->a_cred;
652
653#ifdef MSDOSFS_DEBUG
654 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
655 vp, uio, ioflag, cred);
656 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
657 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
658#endif
659
660 switch (vp->v_type) {
661 case VREG:
662 if (ioflag & IO_APPEND)
663 uio->uio_offset = dep->de_FileSize;
664 thisvp = vp;
665 break;
666 case VDIR:
667 return EISDIR;
668 default:
669 panic("msdosfs_write(): bad file type");
670 }
671
672 if (uio->uio_offset < 0)
673 return (EINVAL);
674
675 if (uio->uio_resid == 0)
676 return (0);
677
678 /*
679 * If they've exceeded their filesize limit, tell them about it.
680 */
681 if (p &&
682 ((uio->uio_offset + uio->uio_resid) >
683 p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) {
684 psignal(p, SIGXFSZ);
685 return (EFBIG);
686 }
687
688 /*
689 * If the offset we are starting the write at is beyond the end of
690 * the file, then they've done a seek. Unix filesystems allow
691 * files with holes in them, DOS doesn't so we must fill the hole
692 * with zeroed blocks.
693 */
694 if (uio->uio_offset > dep->de_FileSize) {
695 error = deextend(dep, uio->uio_offset, cred);
696 if (error)
697 return (error);
698 }
699
700 /*
701 * Remember some values in case the write fails.
702 */
703 resid = uio->uio_resid;
704 osize = dep->de_FileSize;
705
706 /*
707 * If we write beyond the end of the file, extend it to its ultimate
708 * size ahead of the time to hopefully get a contiguous area.
709 */
710 if (uio->uio_offset + resid > osize) {
711 count = de_clcount(pmp, uio->uio_offset + resid) -
712 de_clcount(pmp, osize);
713 error = extendfile(dep, count, NULL, NULL, 0);
714 if (error && (error != ENOSPC || (ioflag & IO_UNIT)))
715 goto errexit;
716 lastcn = dep->de_fc[FC_LASTFC].fc_frcn;
717 } else
718 lastcn = de_clcount(pmp, osize) - 1;
719
720 do {
721 if (de_cluster(pmp, uio->uio_offset) > lastcn) {
722 error = ENOSPC;
723 break;
724 }
725
726 croffset = uio->uio_offset & pmp->pm_crbomask;
727 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset);
728 if (uio->uio_offset + n > dep->de_FileSize) {
729 dep->de_FileSize = uio->uio_offset + n;
730 /* The object size needs to be set before buffer is allocated */
731 vnode_pager_setsize(vp, dep->de_FileSize);
732 }
733
734 bn = de_cluster(pmp, uio->uio_offset);
735 if ((uio->uio_offset & pmp->pm_crbomask) == 0
736 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid)
737 > de_cluster(pmp, uio->uio_offset)
738 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) {
739 /*
740 * If either the whole cluster gets written,
741 * or we write the cluster from its start beyond EOF,
742 * then no need to read data from disk.
743 */
744 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0);
745 clrbuf(bp);
746 /*
747 * Do the bmap now, since pcbmap needs buffers
748 * for the fat table. (see msdosfs_strategy)
749 */
750 if (bp->b_blkno == bp->b_lblkno) {
751 error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno,
752 0, 0);
753 if (error)
754 bp->b_blkno = -1;
755 }
756 if (bp->b_blkno == -1) {
757 brelse(bp);
758 if (!error)
759 error = EIO; /* XXX */
760 break;
761 }
762 } else {
763 /*
764 * The block we need to write into exists, so read it in.
765 */
766 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp);
767 if (error) {
768 brelse(bp);
769 break;
770 }
771 }
772
773 /*
774 * Should these vnode_pager_* functions be done on dir
775 * files?
776 */
777
778 /*
779 * Copy the data from user space into the buf header.
780 */
781 error = uiomove(bp->b_data + croffset, n, uio);
782
783 /*
784 * If they want this synchronous then write it and wait for
785 * it. Otherwise, if on a cluster boundary write it
786 * asynchronously so we can move on to the next block
787 * without delay. Otherwise do a delayed write because we
788 * may want to write somemore into the block later.
789 */
790 if (ioflag & IO_SYNC)
791 (void) bwrite(bp);
792 else if (n + croffset == pmp->pm_bpcluster)
793 bawrite(bp);
794 else
795 bdwrite(bp);
796 dep->de_flag |= DE_UPDATE;
797 } while (error == 0 && uio->uio_resid > 0);
798
799 /*
800 * If the write failed and they want us to, truncate the file back
801 * to the size it was before the write was attempted.
802 */
803errexit:
804 if (error) {
805 if (ioflag & IO_UNIT) {
806 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL);
807 uio->uio_offset -= resid - uio->uio_resid;
808 uio->uio_resid = resid;
809 } else {
810 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL);
811 if (uio->uio_resid != resid)
812 error = 0;
813 }
814 } else if (ioflag & IO_SYNC)
815 error = deupdat(dep, 1);
816 return (error);
817}
818
819/*
820 * Flush the blocks of a file to disk.
821 *
822 * This function is worthless for vnodes that represent directories. Maybe we
823 * could just do a sync if they try an fsync on a directory file.
824 */
825static int
826msdosfs_fsync(ap)
827 struct vop_fsync_args /* {
828 struct vnode *a_vp;
829 struct ucred *a_cred;
830 int a_waitfor;
831 struct proc *a_p;
832 } */ *ap;
833{
834 struct vnode *vp = ap->a_vp;
835 int s;
836 struct buf *bp, *nbp;
837
838 /*
839 * Flush all dirty buffers associated with a vnode.
840 */
841loop:
842 s = splbio();
843 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
844 nbp = TAILQ_NEXT(bp, b_vnbufs);
845 if ((bp->b_flags & B_BUSY))
846 continue;
847 if ((bp->b_flags & B_DELWRI) == 0)
848 panic("msdosfs_fsync: not dirty");
849 bremfree(bp);
850 bp->b_flags |= B_BUSY;
851 splx(s);
852 (void) bwrite(bp);
853 goto loop;
854 }
855 while (vp->v_numoutput) {
856 vp->v_flag |= VBWAIT;
857 (void) tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "msdosfsn", 0);
858 }
859#ifdef DIAGNOSTIC
860 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) {
861 vprint("msdosfs_fsync: dirty", vp);
862 goto loop;
863 }
864#endif
865 splx(s);
866 return (deupdat(VTODE(vp), ap->a_waitfor == MNT_WAIT));
867}
868
869static int
870msdosfs_remove(ap)
871 struct vop_remove_args /* {
872 struct vnode *a_dvp;
873 struct vnode *a_vp;
874 struct componentname *a_cnp;
875 } */ *ap;
876{
877 struct denode *dep = VTODE(ap->a_vp);
878 struct denode *ddep = VTODE(ap->a_dvp);
879 int error;
880
881 if (ap->a_vp->v_type == VDIR)
882 error = EPERM;
883 else
884 error = removede(ddep, dep);
885#ifdef MSDOSFS_DEBUG
886 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount);
887#endif
888 return (error);
889}
890
891/*
892 * DOS filesystems don't know what links are. But since we already called
893 * msdosfs_lookup() with create and lockparent, the parent is locked so we
894 * have to free it before we return the error.
895 */
896static int
897msdosfs_link(ap)
898 struct vop_link_args /* {
899 struct vnode *a_tdvp;
900 struct vnode *a_vp;
901 struct componentname *a_cnp;
902 } */ *ap;
903{
904 VOP_ABORTOP(ap->a_tdvp, ap->a_cnp);
905 return (EOPNOTSUPP);
906}
907
908/*
909 * Renames on files require moving the denode to a new hash queue since the
910 * denode's location is used to compute which hash queue to put the file
911 * in. Unless it is a rename in place. For example "mv a b".
912 *
913 * What follows is the basic algorithm:
914 *
915 * if (file move) {
916 * if (dest file exists) {
917 * remove dest file
918 * }
919 * if (dest and src in same directory) {
920 * rewrite name in existing directory slot
921 * } else {
922 * write new entry in dest directory
923 * update offset and dirclust in denode
924 * move denode to new hash chain
925 * clear old directory entry
926 * }
927 * } else {
928 * directory move
929 * if (dest directory exists) {
930 * if (dest is not empty) {
931 * return ENOTEMPTY
932 * }
933 * remove dest directory
934 * }
935 * if (dest and src in same directory) {
936 * rewrite name in existing entry
937 * } else {
938 * be sure dest is not a child of src directory
939 * write entry in dest directory
940 * update "." and ".." in moved directory
941 * clear old directory entry for moved directory
942 * }
943 * }
944 *
945 * On entry:
946 * source's parent directory is unlocked
947 * source file or directory is unlocked
948 * destination's parent directory is locked
949 * destination file or directory is locked if it exists
950 *
951 * On exit:
952 * all denodes should be released
953 *
954 * Notes:
955 * I'm not sure how the memory containing the pathnames pointed at by the
956 * componentname structures is freed, there may be some memory bleeding
957 * for each rename done.
958 */
959static int
960msdosfs_rename(ap)
961 struct vop_rename_args /* {
962 struct vnode *a_fdvp;
963 struct vnode *a_fvp;
964 struct componentname *a_fcnp;
965 struct vnode *a_tdvp;
966 struct vnode *a_tvp;
967 struct componentname *a_tcnp;
968 } */ *ap;
969{
970 struct vnode *tdvp = ap->a_tdvp;
971 struct vnode *fvp = ap->a_fvp;
972 struct vnode *fdvp = ap->a_fdvp;
973 struct vnode *tvp = ap->a_tvp;
974 struct componentname *tcnp = ap->a_tcnp;
975 struct componentname *fcnp = ap->a_fcnp;
976 struct proc *p = fcnp->cn_proc;
977 struct denode *ip, *xp, *dp, *zp;
978 u_char toname[11], oldname[11];
979 u_long from_diroffset, to_diroffset;
980 u_char to_count;
981 int doingdirectory = 0, newparent = 0;
982 int error;
983 u_long cn;
984 daddr_t bn;
985 struct denode *fddep; /* from file's parent directory */
986 struct denode *fdep; /* from file or directory */
987 struct denode *tddep; /* to file's parent directory */
988 struct denode *tdep; /* to file or directory */
989 struct msdosfsmount *pmp;
990 struct direntry *dotdotp;
991 struct buf *bp;
992
993 fddep = VTODE(ap->a_fdvp);
994 fdep = VTODE(ap->a_fvp);
995 tddep = VTODE(ap->a_tdvp);
996 tdep = tvp ? VTODE(tvp) : NULL;
997 pmp = fddep->de_pmp;
998
999 pmp = VFSTOMSDOSFS(fdvp->v_mount);
1000
1001#ifdef DIAGNOSTIC
1002 if ((tcnp->cn_flags & HASBUF) == 0 ||
1003 (fcnp->cn_flags & HASBUF) == 0)
1004 panic("msdosfs_rename: no name");
1005#endif
1006 /*
1007 * Check for cross-device rename.
1008 */
1009 if ((fvp->v_mount != tdvp->v_mount) ||
1010 (tvp && (fvp->v_mount != tvp->v_mount))) {
1011 error = EXDEV;
1012abortit:
1013 VOP_ABORTOP(tdvp, tcnp);
1014 if (tdvp == tvp)
1015 vrele(tdvp);
1016 else
1017 vput(tdvp);
1018 if (tvp)
1019 vput(tvp);
1020 VOP_ABORTOP(fdvp, fcnp);
1021 vrele(fdvp);
1022 vrele(fvp);
1023 return (error);
1024 }
1025
1026 /*
1027 * If source and dest are the same, do nothing.
1028 */
1029 if (tvp == fvp) {
1030 error = 0;
1031 goto abortit;
1032 }
1033
1034 error = vn_lock(fvp, LK_EXCLUSIVE, p);
1035 if (error)
1036 goto abortit;
1037 dp = VTODE(fdvp);
1038 ip = VTODE(fvp);
1039
1040 /*
1041 * Be sure we are not renaming ".", "..", or an alias of ".". This
1042 * leads to a crippled directory tree. It's pretty tough to do a
1043 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
1044 * doesn't work if the ".." entry is missing.
1045 */
1046 if (ip->de_Attributes & ATTR_DIRECTORY) {
1047 /*
1048 * Avoid ".", "..", and aliases of "." for obvious reasons.
1049 */
1050 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
1051 dp == ip ||
1052 (fcnp->cn_flags & ISDOTDOT) ||
1053 (tcnp->cn_flags & ISDOTDOT) ||
1054 (ip->de_flag & DE_RENAME)) {
1055 VOP_UNLOCK(fvp, 0, p);
1056 error = EINVAL;
1057 goto abortit;
1058 }
1059 ip->de_flag |= DE_RENAME;
1060 doingdirectory++;
1061 }
1062
1063 /*
1064 * When the target exists, both the directory
1065 * and target vnodes are returned locked.
1066 */
1067 dp = VTODE(tdvp);
1068 xp = tvp ? VTODE(tvp) : NULL;
1069 /*
1070 * Remember direntry place to use for destination
1071 */
1072 to_diroffset = dp->de_fndoffset;
1073 to_count = dp->de_fndcnt;
1074
1075 /*
1076 * If ".." must be changed (ie the directory gets a new
1077 * parent) then the source directory must not be in the
1078 * directory heirarchy above the target, as this would
1079 * orphan everything below the source directory. Also
1080 * the user must have write permission in the source so
1081 * as to be able to change "..". We must repeat the call
1082 * to namei, as the parent directory is unlocked by the
1083 * call to doscheckpath().
1084 */
1085 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc);
1086 VOP_UNLOCK(fvp, 0, p);
1087 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
1088 newparent = 1;
1089 vrele(fdvp);
1090 if (doingdirectory && newparent) {
1091 if (error) /* write access check above */
1092 goto bad;
1093 if (xp != NULL)
1094 vput(tvp);
1095 /*
1096 * doscheckpath() vput()'s dp,
1097 * so we have to do a relookup afterwards
1098 */
1099 error = doscheckpath(ip, dp);
1100 if (error)
1101 goto out;
1102 if ((tcnp->cn_flags & SAVESTART) == 0)
1103 panic("msdosfs_rename: lost to startdir");
1104 error = relookup(tdvp, &tvp, tcnp);
1105 if (error)
1106 goto out;
1107 dp = VTODE(tdvp);
1108 xp = tvp ? VTODE(tvp) : NULL;
1109 }
1110
1111 if (xp != NULL) {
1112 /*
1113 * Target must be empty if a directory and have no links
1114 * to it. Also, ensure source and target are compatible
1115 * (both directories, or both not directories).
1116 */
1117 if (xp->de_Attributes & ATTR_DIRECTORY) {
1118 if (!dosdirempty(xp)) {
1119 error = ENOTEMPTY;
1120 goto bad;
1121 }
1122 if (!doingdirectory) {
1123 error = ENOTDIR;
1124 goto bad;
1125 }
1126 cache_purge(tdvp);
1127 } else if (doingdirectory) {
1128 error = EISDIR;
1129 goto bad;
1130 }
1131 error = removede(dp, xp);
1132 if (error)
1133 goto bad;
1134 vput(tvp);
1135 xp = NULL;
1136 }
1137
1138 /*
1139 * Convert the filename in tcnp into a dos filename. We copy this
1140 * into the denode and directory entry for the destination
1141 * file/directory.
1142 */
1143 error = uniqdosname(VTODE(tdvp), tcnp, toname);
1144 if (error)
1145 goto abortit;
1146
1147 /*
1148 * Since from wasn't locked at various places above,
1149 * have to do a relookup here.
1150 */
1151 fcnp->cn_flags &= ~MODMASK;
1152 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1153 if ((fcnp->cn_flags & SAVESTART) == 0)
1154 panic("msdosfs_rename: lost from startdir");
1155 if (!newparent)
1156 VOP_UNLOCK(tdvp, 0, p);
1157 (void) relookup(fdvp, &fvp, fcnp);
1158 if (fvp == NULL) {
1159 /*
1160 * From name has disappeared.
1161 */
1162 if (doingdirectory)
1163 panic("rename: lost dir entry");
1164 vrele(ap->a_fvp);
1165 if (newparent)
1166 VOP_UNLOCK(tdvp, 0, p);
1167 vrele(tdvp);
1168 return 0;
1169 }
1170 xp = VTODE(fvp);
1171 zp = VTODE(fdvp);
1172 from_diroffset = zp->de_fndoffset;
1173
1174 /*
1175 * Ensure that the directory entry still exists and has not
1176 * changed till now. If the source is a file the entry may
1177 * have been unlinked or renamed. In either case there is
1178 * no further work to be done. If the source is a directory
1179 * then it cannot have been rmdir'ed or renamed; this is
1180 * prohibited by the DE_RENAME flag.
1181 */
1182 if (xp != ip) {
1183 if (doingdirectory)
1184 panic("rename: lost dir entry");
1185 vrele(ap->a_fvp);
1186 VOP_UNLOCK(fvp, 0, p);
1187 if (newparent)
1188 VOP_UNLOCK(fdvp, 0, p);
1189 xp = NULL;
1190 } else {
1191 vrele(fvp);
1192 xp = NULL;
1193
1194 /*
1195 * First write a new entry in the destination
1196 * directory and mark the entry in the source directory
1197 * as deleted. Then move the denode to the correct hash
1198 * chain for its new location in the filesystem. And, if
1199 * we moved a directory, then update its .. entry to point
1200 * to the new parent directory.
1201 */
1202 bcopy(ip->de_Name, oldname, 11);
1203 bcopy(toname, ip->de_Name, 11); /* update denode */
1204 dp->de_fndoffset = to_diroffset;
1205 dp->de_fndcnt = to_count;
1206 error = createde(ip, dp, (struct denode **)0, tcnp);
1207 if (error) {
1208 bcopy(oldname, ip->de_Name, 11);
1209 if (newparent)
1210 VOP_UNLOCK(fdvp, 0, p);
1211 VOP_UNLOCK(fvp, 0, p);
1212 goto bad;
1213 }
1214 ip->de_refcnt++;
1215 zp->de_fndoffset = from_diroffset;
1216 error = removede(zp, ip);
1217 if (error) {
1218 /* XXX should really panic here, fs is corrupt */
1219 if (newparent)
1220 VOP_UNLOCK(fdvp, 0, p);
1221 VOP_UNLOCK(fvp, 0, p);
1222 goto bad;
1223 }
1224 if (!doingdirectory) {
1225 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0,
1226 &ip->de_dirclust, 0);
1227 if (error) {
1228 /* XXX should really panic here, fs is corrupt */
1229 if (newparent)
1230 VOP_UNLOCK(fdvp, 0, p);
1231 VOP_UNLOCK(fvp, 0, p);
1232 goto bad;
1233 }
1234 if (ip->de_dirclust == MSDOSFSROOT)
1235 ip->de_diroffset = to_diroffset;
1236 else
1237 ip->de_diroffset = to_diroffset & pmp->pm_crbomask;
1238 }
1239 reinsert(ip);
1240 if (newparent)
1241 VOP_UNLOCK(fdvp, 0, p);
1242 }
1243
1244 /*
1245 * If we moved a directory to a new parent directory, then we must
1246 * fixup the ".." entry in the moved directory.
1247 */
1248 if (doingdirectory && newparent) {
1249 cn = ip->de_StartCluster;
1250 if (cn == MSDOSFSROOT) {
1251 /* this should never happen */
1252 panic("msdosfs_rename(): updating .. in root directory?");
1253 } else
1254 bn = cntobn(pmp, cn);
1255 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
1256 NOCRED, &bp);
1257 if (error) {
1258 /* XXX should really panic here, fs is corrupt */
1259 brelse(bp);
1260 VOP_UNLOCK(fvp, 0, p);
1261 goto bad;
1262 }
1263 dotdotp = (struct direntry *)bp->b_data + 1;
1264 putushort(dotdotp->deStartCluster, dp->de_StartCluster);
1265 if (FAT32(pmp))
1266 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16);
1267 error = bwrite(bp);
1268 if (error) {
1269 /* XXX should really panic here, fs is corrupt */
1270 VOP_UNLOCK(fvp, 0, p);
1271 goto bad;
1272 }
1273 }
1274
1275 VOP_UNLOCK(fvp, 0, p);
1276bad:
1277 if (xp)
1278 vput(tvp);
1279 vput(tdvp);
1280out:
1281 ip->de_flag &= ~DE_RENAME;
1282 vrele(fdvp);
1283 vrele(fvp);
1284 return (error);
1285
1286}
1287
1288static struct {
1289 struct direntry dot;
1290 struct direntry dotdot;
1291} dosdirtemplate = {
1292 { ". ", " ", /* the . entry */
1293 ATTR_DIRECTORY, /* file attribute */
1294 0, /* reserved */
1295 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1296 { 0, 0 }, /* access date */
1297 { 0, 0 }, /* high bits of start cluster */
1298 { 210, 4 }, { 210, 4 }, /* modify time & date */
1299 { 0, 0 }, /* startcluster */
1300 { 0, 0, 0, 0 } /* filesize */
1301 },
1302 { ".. ", " ", /* the .. entry */
1303 ATTR_DIRECTORY, /* file attribute */
1304 0, /* reserved */
1305 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1306 { 0, 0 }, /* access date */
1307 { 0, 0 }, /* high bits of start cluster */
1308 { 210, 4 }, { 210, 4 }, /* modify time & date */
1309 { 0, 0 }, /* startcluster */
1310 { 0, 0, 0, 0 } /* filesize */
1311 }
1312};
1313
1314static int
1315msdosfs_mkdir(ap)
1316 struct vop_mkdir_args /* {
1317 struct vnode *a_dvp;
1318 struvt vnode **a_vpp;
1319 struvt componentname *a_cnp;
1320 struct vattr *a_vap;
1321 } */ *ap;
1322{
1323 struct componentname *cnp = ap->a_cnp;
1324 struct denode *dep;
1325 struct denode *pdep = VTODE(ap->a_dvp);
1326 struct direntry *denp;
1327 struct msdosfsmount *pmp = pdep->de_pmp;
1328 struct buf *bp;
1329 u_long newcluster, pcl;
1330 int bn;
1331 int error;
1332 struct denode ndirent;
1333 struct timespec ts;
1334
1335 /*
1336 * If this is the root directory and there is no space left we
1337 * can't do anything. This is because the root directory can not
1338 * change size.
1339 */
1340 if (pdep->de_StartCluster == MSDOSFSROOT
1341 && pdep->de_fndoffset >= pdep->de_FileSize) {
1342 error = ENOSPC;
1343 goto bad2;
1344 }
1345
1346 /*
1347 * Allocate a cluster to hold the about to be created directory.
1348 */
1349 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL);
1350 if (error)
1351 goto bad2;
1352
1353 bzero(&ndirent, sizeof(ndirent));
1354 ndirent.de_pmp = pmp;
1355 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1356 getnanotime(&ts);
1357 DETIMES(&ndirent, &ts, &ts, &ts);
1358
1359 /*
1360 * Now fill the cluster with the "." and ".." entries. And write
1361 * the cluster to disk. This way it is there for the parent
1362 * directory to be pointing at if there were a crash.
1363 */
1364 bn = cntobn(pmp, newcluster);
1365 /* always succeeds */
1366 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0);
1367 bzero(bp->b_data, pmp->pm_bpcluster);
1368 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate);
1369 denp = (struct direntry *)bp->b_data;
1370 putushort(denp[0].deStartCluster, newcluster);
1371 putushort(denp[0].deCDate, ndirent.de_CDate);
1372 putushort(denp[0].deCTime, ndirent.de_CTime);
1373 denp[0].deCHundredth = ndirent.de_CHun;
1374 putushort(denp[0].deADate, ndirent.de_ADate);
1375 putushort(denp[0].deMDate, ndirent.de_MDate);
1376 putushort(denp[0].deMTime, ndirent.de_MTime);
1377 pcl = pdep->de_StartCluster;
1378 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1379 pcl = 0;
1380 putushort(denp[1].deStartCluster, pcl);
1381 putushort(denp[1].deCDate, ndirent.de_CDate);
1382 putushort(denp[1].deCTime, ndirent.de_CTime);
1383 denp[1].deCHundredth = ndirent.de_CHun;
1384 putushort(denp[1].deADate, ndirent.de_ADate);
1385 putushort(denp[1].deMDate, ndirent.de_MDate);
1386 putushort(denp[1].deMTime, ndirent.de_MTime);
1387 if (FAT32(pmp)) {
1388 putushort(denp[0].deHighClust, newcluster >> 16);
1389 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16);
1390 }
1391
1392 error = bwrite(bp);
1393 if (error)
1394 goto bad;
1395
1396 /*
1397 * Now build up a directory entry pointing to the newly allocated
1398 * cluster. This will be written to an empty slot in the parent
1399 * directory.
1400 */
1401#ifdef DIAGNOSTIC
1402 if ((cnp->cn_flags & HASBUF) == 0)
1403 panic("msdosfs_mkdir: no name");
1404#endif
1405 error = uniqdosname(pdep, cnp, ndirent.de_Name);
1406 if (error)
1407 goto bad;
1408
1409 ndirent.de_Attributes = ATTR_DIRECTORY;
1410 ndirent.de_LowerCase = 0;
1411 ndirent.de_StartCluster = newcluster;
1412 ndirent.de_FileSize = 0;
1413 ndirent.de_dev = pdep->de_dev;
1414 ndirent.de_devvp = pdep->de_devvp;
1415 error = createde(&ndirent, pdep, &dep, cnp);
1416 if (error)
1417 goto bad;
1418 if ((cnp->cn_flags & SAVESTART) == 0)
1419 zfree(namei_zone, cnp->cn_pnbuf);
1420 *ap->a_vpp = DETOV(dep);
1421 return (0);
1422
1423bad:
1424 clusterfree(pmp, newcluster, NULL);
1425bad2:
1426 zfree(namei_zone, cnp->cn_pnbuf);
1427 return (error);
1428}
1429
1430static int
1431msdosfs_rmdir(ap)
1432 struct vop_rmdir_args /* {
1433 struct vnode *a_dvp;
1434 struct vnode *a_vp;
1435 struct componentname *a_cnp;
1436 } */ *ap;
1437{
1438 register struct vnode *vp = ap->a_vp;
1439 register struct vnode *dvp = ap->a_dvp;
1440 register struct componentname *cnp = ap->a_cnp;
1441 register struct denode *ip, *dp;
1442 struct proc *p = cnp->cn_proc;
1443 int error;
1444
1445 ip = VTODE(vp);
1446 dp = VTODE(dvp);
1447
1448 /*
1449 * Verify the directory is empty (and valid).
1450 * (Rmdir ".." won't be valid since
1451 * ".." will contain a reference to
1452 * the current directory and thus be
1453 * non-empty.)
1454 */
1455 error = 0;
1456 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) {
1457 error = ENOTEMPTY;
1458 goto out;
1459 }
1460 /*
1461 * Delete the entry from the directory. For dos filesystems this
1462 * gets rid of the directory entry on disk, the in memory copy
1463 * still exists but the de_refcnt is <= 0. This prevents it from
1464 * being found by deget(). When the vput() on dep is done we give
1465 * up access and eventually msdosfs_reclaim() will be called which
1466 * will remove it from the denode cache.
1467 */
1468 error = removede(dp, ip);
1469 if (error)
1470 goto out;
1471 /*
1472 * This is where we decrement the link count in the parent
1473 * directory. Since dos filesystems don't do this we just purge
1474 * the name cache.
1475 */
1476 cache_purge(dvp);
1477 VOP_UNLOCK(dvp, 0, p);
1478 /*
1479 * Truncate the directory that is being deleted.
1480 */
1481 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, p);
1482 cache_purge(vp);
1483
1484 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, p);
1485out:
1486 return (error);
1487}
1488
1489/*
1490 * DOS filesystems don't know what symlinks are.
1491 */
1492static int
1493msdosfs_symlink(ap)
1494 struct vop_symlink_args /* {
1495 struct vnode *a_dvp;
1496 struct vnode **a_vpp;
1497 struct componentname *a_cnp;
1498 struct vattr *a_vap;
1499 char *a_target;
1500 } */ *ap;
1501{
1502 zfree(namei_zone, ap->a_cnp->cn_pnbuf);
1503 /* VOP_ABORTOP(ap->a_dvp, ap->a_cnp); ??? */
1504 return (EOPNOTSUPP);
1505}
1506
1507static int
1508msdosfs_readdir(ap)
1509 struct vop_readdir_args /* {
1510 struct vnode *a_vp;
1511 struct uio *a_uio;
1512 struct ucred *a_cred;
1513 int *a_eofflag;
1514 int *a_ncookies;
1515 u_long **a_cookies;
1516 } */ *ap;
1517{
1518 int error = 0;
1519 int diff;
1520 long n;
1521 int blsize;
1522 long on;
1523 u_long cn;
1524 u_long fileno;
1525 u_long dirsperblk;
1526 long bias = 0;
1527 daddr_t bn, lbn;
1528 struct buf *bp;
1529 struct denode *dep = VTODE(ap->a_vp);
1530 struct msdosfsmount *pmp = dep->de_pmp;
1531 struct direntry *dentp;
1532 struct dirent dirbuf;
1533 struct uio *uio = ap->a_uio;
1534 u_long *cookies = NULL;
1535 int ncookies = 0;
1536 off_t offset, off;
1537 int chksum = -1;
1538
1539#ifdef MSDOSFS_DEBUG
1540 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
1541 ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
1542#endif
1543
1544 /*
1545 * msdosfs_readdir() won't operate properly on regular files since
1546 * it does i/o only with the the filesystem vnode, and hence can
1547 * retrieve the wrong block from the buffer cache for a plain file.
1548 * So, fail attempts to readdir() on a plain file.
1549 */
1550 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
1551 return (ENOTDIR);
1552
1553 /*
1554 * To be safe, initialize dirbuf
1555 */
1556 bzero(dirbuf.d_name, sizeof(dirbuf.d_name));
1557
1558 /*
1559 * If the user buffer is smaller than the size of one dos directory
1560 * entry or the file offset is not a multiple of the size of a
1561 * directory entry, then we fail the read.
1562 */
1563 off = offset = uio->uio_offset;
1564 if (uio->uio_resid < sizeof(struct direntry) ||
1565 (offset & (sizeof(struct direntry) - 1)))
1566 return (EINVAL);
1567
1568 if (ap->a_ncookies) {
1569 ncookies = uio->uio_resid / 16;
1570 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP,
1571 M_WAITOK);
1572 *ap->a_cookies = cookies;
1573 *ap->a_ncookies = ncookies;
1574 }
1575
1576 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1577
1578 /*
1579 * If they are reading from the root directory then, we simulate
1580 * the . and .. entries since these don't exist in the root
1581 * directory. We also set the offset bias to make up for having to
1582 * simulate these entries. By this I mean that at file offset 64 we
1583 * read the first entry in the root directory that lives on disk.
1584 */
1585 if (dep->de_StartCluster == MSDOSFSROOT
1586 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
1587#if 0
1588 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n",
1589 offset);
1590#endif
1591 bias = 2 * sizeof(struct direntry);
1592 if (offset < bias) {
1593 for (n = (int)offset / sizeof(struct direntry);
1594 n < 2; n++) {
1595 if (FAT32(pmp))
1596 dirbuf.d_fileno = cntobn(pmp,
1597 pmp->pm_rootdirblk)
1598 * dirsperblk;
1599 else
1600 dirbuf.d_fileno = 1;
1601 dirbuf.d_type = DT_DIR;
1602 switch (n) {
1603 case 0:
1604 dirbuf.d_namlen = 1;
1605 strcpy(dirbuf.d_name, ".");
1606 break;
1607 case 1:
1608 dirbuf.d_namlen = 2;
1609 strcpy(dirbuf.d_name, "..");
1610 break;
1611 }
1612 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1613 if (uio->uio_resid < dirbuf.d_reclen)
1614 goto out;
1615 error = uiomove((caddr_t) &dirbuf,
1616 dirbuf.d_reclen, uio);
1617 if (error)
1618 goto out;
1619 offset += sizeof(struct direntry);
1620 off = offset;
1621 if (cookies) {
1622 *cookies++ = offset;
1623 if (--ncookies <= 0)
1624 goto out;
1625 }
1626 }
1627 }
1628 }
1629
1630 off = offset;
1631 while (uio->uio_resid > 0) {
1632 lbn = de_cluster(pmp, offset - bias);
1633 on = (offset - bias) & pmp->pm_crbomask;
1634 n = min(pmp->pm_bpcluster - on, uio->uio_resid);
1635 diff = dep->de_FileSize - (offset - bias);
1636 if (diff <= 0)
1637 break;
1638 n = min(n, diff);
1639 error = pcbmap(dep, lbn, &bn, &cn, &blsize);
1640 if (error)
1641 break;
1642 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp);
1643 if (error) {
1644 brelse(bp);
1645 return (error);
1646 }
1647 n = min(n, blsize - bp->b_resid);
1648
1649 /*
1650 * Convert from dos directory entries to fs-independent
1651 * directory entries.
1652 */
1653 for (dentp = (struct direntry *)(bp->b_data + on);
1654 (char *)dentp < bp->b_data + on + n;
1655 dentp++, offset += sizeof(struct direntry)) {
1656#if 0
1657 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
1658 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
1659#endif
1660 /*
1661 * If this is an unused entry, we can stop.
1662 */
1663 if (dentp->deName[0] == SLOT_EMPTY) {
1664 brelse(bp);
1665 goto out;
1666 }
1667 /*
1668 * Skip deleted entries.
1669 */
1670 if (dentp->deName[0] == SLOT_DELETED) {
1671 chksum = -1;
1672 continue;
1673 }
1674
1675 /*
1676 * Handle Win95 long directory entries
1677 */
1678 if (dentp->deAttributes == ATTR_WIN95) {
1679 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
1680 continue;
1681 chksum = win2unixfn((struct winentry *)dentp,
1682 &dirbuf, chksum,
1683 pmp->pm_flags & MSDOSFSMNT_U2WTABLE,
1684 pmp->pm_u2w);
1685 continue;
1686 }
1687
1688 /*
1689 * Skip volume labels
1690 */
1691 if (dentp->deAttributes & ATTR_VOLUME) {
1692 chksum = -1;
1693 continue;
1694 }
1695 /*
1696 * This computation of d_fileno must match
1697 * the computation of va_fileid in
1698 * msdosfs_getattr.
1699 */
1700 if (dentp->deAttributes & ATTR_DIRECTORY) {
1701 fileno = getushort(dentp->deStartCluster);
1702 if (FAT32(pmp))
1703 fileno |= getushort(dentp->deHighClust) << 16;
1704 /* if this is the root directory */
1705 if (fileno == MSDOSFSROOT)
1706 if (FAT32(pmp))
1707 fileno = cntobn(pmp,
1708 pmp->pm_rootdirblk)
1709 * dirsperblk;
1710 else
1711 fileno = 1;
1712 else
1713 fileno = cntobn(pmp, fileno) * dirsperblk;
1714 dirbuf.d_fileno = fileno;
1715 dirbuf.d_type = DT_DIR;
1716 } else {
1717 dirbuf.d_fileno = offset / sizeof(struct direntry);
1718 dirbuf.d_type = DT_REG;
1719 }
1720 if (chksum != winChksum(dentp->deName))
1721 dirbuf.d_namlen = dos2unixfn(dentp->deName,
1722 (u_char *)dirbuf.d_name,
1723 dentp->deLowerCase |
1724 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ?
1725 (LCASE_BASE | LCASE_EXT) : 0),
1726 pmp->pm_flags & MSDOSFSMNT_U2WTABLE,
1727 pmp->pm_d2u,
1728 pmp->pm_flags & MSDOSFSMNT_ULTABLE,
1729 pmp->pm_ul);
1730 else
1731 dirbuf.d_name[dirbuf.d_namlen] = 0;
1732 chksum = -1;
1733 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1734 if (uio->uio_resid < dirbuf.d_reclen) {
1735 brelse(bp);
1736 goto out;
1737 }
1738 error = uiomove((caddr_t) &dirbuf,
1739 dirbuf.d_reclen, uio);
1740 if (error) {
1741 brelse(bp);
1742 goto out;
1743 }
1744 if (cookies) {
1745 *cookies++ = offset + sizeof(struct direntry);
1746 if (--ncookies <= 0) {
1747 brelse(bp);
1748 goto out;
1749 }
1750 }
1751 off = offset + sizeof(struct direntry);
1752 }
1753 brelse(bp);
1754 }
1755out:
1756 /* Subtract unused cookies */
1757 if (ap->a_ncookies)
1758 *ap->a_ncookies -= ncookies;
1759
1760 uio->uio_offset = off;
1761
1762 /*
1763 * Set the eofflag (NFS uses it)
1764 */
| 2/* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $ */
3
4/*-
5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
7 * All rights reserved.
8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by TooLs GmbH.
21 * 4. The name of TooLs GmbH may not be used to endorse or promote products
22 * derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35/*
36 * Written by Paul Popelka (paulp@uts.amdahl.com)
37 *
38 * You can do anything you want with this software, just don't say you wrote
39 * it, and don't remove this notice.
40 *
41 * This software is provided "as is".
42 *
43 * The author supplies this software to be publicly redistributed on the
44 * understanding that the author is not responsible for the correct
45 * functioning of this software in any circumstances and is not liable for
46 * any damages caused by this software.
47 *
48 * October 1992
49 */
50
51#include <sys/param.h>
52#include <sys/systm.h>
53#include <sys/namei.h>
54#include <sys/resourcevar.h> /* defines plimit structure in proc struct */
55#include <sys/kernel.h>
56#include <sys/stat.h>
57#include <sys/buf.h>
58#include <sys/proc.h>
59#include <sys/mount.h>
60#include <sys/unistd.h>
61#include <sys/vnode.h>
62#include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */
63#include <sys/malloc.h>
64#include <sys/dirent.h>
65#include <sys/signalvar.h>
66
67#include <vm/vm.h>
68#include <vm/vm_extern.h>
69#include <vm/vm_zone.h>
70#include <vm/vnode_pager.h>
71
72#include <msdosfs/bpb.h>
73#include <msdosfs/direntry.h>
74#include <msdosfs/denode.h>
75#include <msdosfs/msdosfsmount.h>
76#include <msdosfs/fat.h>
77
78/*
79 * Prototypes for MSDOSFS vnode operations
80 */
81static int msdosfs_create __P((struct vop_create_args *));
82static int msdosfs_mknod __P((struct vop_mknod_args *));
83static int msdosfs_close __P((struct vop_close_args *));
84static int msdosfs_access __P((struct vop_access_args *));
85static int msdosfs_getattr __P((struct vop_getattr_args *));
86static int msdosfs_setattr __P((struct vop_setattr_args *));
87static int msdosfs_read __P((struct vop_read_args *));
88static int msdosfs_write __P((struct vop_write_args *));
89static int msdosfs_fsync __P((struct vop_fsync_args *));
90static int msdosfs_remove __P((struct vop_remove_args *));
91static int msdosfs_link __P((struct vop_link_args *));
92static int msdosfs_rename __P((struct vop_rename_args *));
93static int msdosfs_mkdir __P((struct vop_mkdir_args *));
94static int msdosfs_rmdir __P((struct vop_rmdir_args *));
95static int msdosfs_symlink __P((struct vop_symlink_args *));
96static int msdosfs_readdir __P((struct vop_readdir_args *));
97static int msdosfs_abortop __P((struct vop_abortop_args *));
98static int msdosfs_bmap __P((struct vop_bmap_args *));
99static int msdosfs_strategy __P((struct vop_strategy_args *));
100static int msdosfs_print __P((struct vop_print_args *));
101static int msdosfs_pathconf __P((struct vop_pathconf_args *ap));
102static int msdosfs_getpages __P((struct vop_getpages_args *));
103static int msdosfs_putpages __P((struct vop_putpages_args *));
104
105/*
106 * Some general notes:
107 *
108 * In the ufs filesystem the inodes, superblocks, and indirect blocks are
109 * read/written using the vnode for the filesystem. Blocks that represent
110 * the contents of a file are read/written using the vnode for the file
111 * (including directories when they are read/written as files). This
112 * presents problems for the dos filesystem because data that should be in
113 * an inode (if dos had them) resides in the directory itself. Since we
114 * must update directory entries without the benefit of having the vnode
115 * for the directory we must use the vnode for the filesystem. This means
116 * that when a directory is actually read/written (via read, write, or
117 * readdir, or seek) we must use the vnode for the filesystem instead of
118 * the vnode for the directory as would happen in ufs. This is to insure we
119 * retreive the correct block from the buffer cache since the hash value is
120 * based upon the vnode address and the desired block number.
121 */
122
123/*
124 * Create a regular file. On entry the directory to contain the file being
125 * created is locked. We must release before we return. We must also free
126 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or
127 * only if the SAVESTART bit in cn_flags is clear on success.
128 */
129static int
130msdosfs_create(ap)
131 struct vop_create_args /* {
132 struct vnode *a_dvp;
133 struct vnode **a_vpp;
134 struct componentname *a_cnp;
135 struct vattr *a_vap;
136 } */ *ap;
137{
138 struct componentname *cnp = ap->a_cnp;
139 struct denode ndirent;
140 struct denode *dep;
141 struct denode *pdep = VTODE(ap->a_dvp);
142 struct timespec ts;
143 int error;
144
145#ifdef MSDOSFS_DEBUG
146 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap);
147#endif
148
149 /*
150 * If this is the root directory and there is no space left we
151 * can't do anything. This is because the root directory can not
152 * change size.
153 */
154 if (pdep->de_StartCluster == MSDOSFSROOT
155 && pdep->de_fndoffset >= pdep->de_FileSize) {
156 error = ENOSPC;
157 goto bad;
158 }
159
160 /*
161 * Create a directory entry for the file, then call createde() to
162 * have it installed. NOTE: DOS files are always executable. We
163 * use the absence of the owner write bit to make the file
164 * readonly.
165 */
166#ifdef DIAGNOSTIC
167 if ((cnp->cn_flags & HASBUF) == 0)
168 panic("msdosfs_create: no name");
169#endif
170 bzero(&ndirent, sizeof(ndirent));
171 error = uniqdosname(pdep, cnp, ndirent.de_Name);
172 if (error)
173 goto bad;
174
175 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ?
176 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY;
177 ndirent.de_LowerCase = 0;
178 ndirent.de_StartCluster = 0;
179 ndirent.de_FileSize = 0;
180 ndirent.de_dev = pdep->de_dev;
181 ndirent.de_devvp = pdep->de_devvp;
182 ndirent.de_pmp = pdep->de_pmp;
183 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
184 getnanotime(&ts);
185 DETIMES(&ndirent, &ts, &ts, &ts);
186 error = createde(&ndirent, pdep, &dep, cnp);
187 if (error)
188 goto bad;
189 if ((cnp->cn_flags & SAVESTART) == 0)
190 zfree(namei_zone, cnp->cn_pnbuf);
191 *ap->a_vpp = DETOV(dep);
192 return (0);
193
194bad:
195 zfree(namei_zone, cnp->cn_pnbuf);
196 return (error);
197}
198
199static int
200msdosfs_mknod(ap)
201 struct vop_mknod_args /* {
202 struct vnode *a_dvp;
203 struct vnode **a_vpp;
204 struct componentname *a_cnp;
205 struct vattr *a_vap;
206 } */ *ap;
207{
208
209 switch (ap->a_vap->va_type) {
210 case VDIR:
211 return (msdosfs_mkdir((struct vop_mkdir_args *)ap));
212 break;
213
214 case VREG:
215 return (msdosfs_create((struct vop_create_args *)ap));
216 break;
217
218 default:
219 zfree(namei_zone, ap->a_cnp->cn_pnbuf);
220 return (EINVAL);
221 }
222 /* NOTREACHED */
223}
224
225static int
226msdosfs_close(ap)
227 struct vop_close_args /* {
228 struct vnode *a_vp;
229 int a_fflag;
230 struct ucred *a_cred;
231 struct proc *a_p;
232 } */ *ap;
233{
234 struct vnode *vp = ap->a_vp;
235 struct denode *dep = VTODE(vp);
236 struct timespec ts;
237
238 simple_lock(&vp->v_interlock);
239 if (vp->v_usecount > 1) {
240 getnanotime(&ts);
241 DETIMES(dep, &ts, &ts, &ts);
242 }
243 simple_unlock(&vp->v_interlock);
244 return 0;
245}
246
247static int
248msdosfs_access(ap)
249 struct vop_access_args /* {
250 struct vnode *a_vp;
251 int a_mode;
252 struct ucred *a_cred;
253 struct proc *a_p;
254 } */ *ap;
255{
256 struct vnode *vp = ap->a_vp;
257 struct denode *dep = VTODE(ap->a_vp);
258 struct msdosfsmount *pmp = dep->de_pmp;
259 struct ucred *cred = ap->a_cred;
260 mode_t mask, file_mode, mode = ap->a_mode;
261 register gid_t *gp;
262 int i;
263
264 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) |
265 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH));
266 file_mode &= pmp->pm_mask;
267
268 /*
269 * Disallow write attempts on read-only file systems;
270 * unless the file is a socket, fifo, or a block or
271 * character device resident on the file system.
272 */
273 if (mode & VWRITE) {
274 switch (vp->v_type) {
275 case VDIR:
276 case VLNK:
277 case VREG:
278 if (vp->v_mount->mnt_flag & MNT_RDONLY)
279 return (EROFS);
280 break;
281 default:
282 break;
283 }
284 }
285
286 /* User id 0 always gets access. */
287 if (cred->cr_uid == 0)
288 return 0;
289
290 mask = 0;
291
292 /* Otherwise, check the owner. */
293 if (cred->cr_uid == pmp->pm_uid) {
294 if (mode & VEXEC)
295 mask |= S_IXUSR;
296 if (mode & VREAD)
297 mask |= S_IRUSR;
298 if (mode & VWRITE)
299 mask |= S_IWUSR;
300 return (file_mode & mask) == mask ? 0 : EACCES;
301 }
302
303 /* Otherwise, check the groups. */
304 for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
305 if (pmp->pm_gid == *gp) {
306 if (mode & VEXEC)
307 mask |= S_IXGRP;
308 if (mode & VREAD)
309 mask |= S_IRGRP;
310 if (mode & VWRITE)
311 mask |= S_IWGRP;
312 return (file_mode & mask) == mask ? 0 : EACCES;
313 }
314
315 /* Otherwise, check everyone else. */
316 if (mode & VEXEC)
317 mask |= S_IXOTH;
318 if (mode & VREAD)
319 mask |= S_IROTH;
320 if (mode & VWRITE)
321 mask |= S_IWOTH;
322 return (file_mode & mask) == mask ? 0 : EACCES;
323}
324
325static int
326msdosfs_getattr(ap)
327 struct vop_getattr_args /* {
328 struct vnode *a_vp;
329 struct vattr *a_vap;
330 struct ucred *a_cred;
331 struct proc *a_p;
332 } */ *ap;
333{
334 struct denode *dep = VTODE(ap->a_vp);
335 struct msdosfsmount *pmp = dep->de_pmp;
336 struct vattr *vap = ap->a_vap;
337 mode_t mode;
338 struct timespec ts;
339 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
340 u_long fileid;
341
342 getnanotime(&ts);
343 DETIMES(dep, &ts, &ts, &ts);
344 vap->va_fsid = dep->de_dev;
345 /*
346 * The following computation of the fileid must be the same as that
347 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
348 * doesn't work.
349 */
350 if (dep->de_Attributes & ATTR_DIRECTORY) {
351 fileid = cntobn(pmp, dep->de_StartCluster) * dirsperblk;
352 if (dep->de_StartCluster == MSDOSFSROOT)
353 fileid = 1;
354 } else {
355 fileid = cntobn(pmp, dep->de_dirclust) * dirsperblk;
356 if (dep->de_dirclust == MSDOSFSROOT)
357 fileid = roottobn(pmp, 0) * dirsperblk;
358 fileid += dep->de_diroffset / sizeof(struct direntry);
359 }
360 vap->va_fileid = fileid;
361 if ((dep->de_Attributes & ATTR_READONLY) == 0)
362 mode = S_IRWXU|S_IRWXG|S_IRWXO;
363 else
364 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
365 vap->va_mode = mode & pmp->pm_mask;
366 vap->va_uid = pmp->pm_uid;
367 vap->va_gid = pmp->pm_gid;
368 vap->va_nlink = 1;
369 vap->va_rdev = 0;
370 vap->va_size = dep->de_FileSize;
371 dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime);
372 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
373 dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime);
374 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, &vap->va_ctime);
375 } else {
376 vap->va_atime = vap->va_mtime;
377 vap->va_ctime = vap->va_mtime;
378 }
379 vap->va_flags = 0;
380 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0)
381 vap->va_flags |= SF_ARCHIVED;
382 vap->va_gen = 0;
383 vap->va_blocksize = pmp->pm_bpcluster;
384 vap->va_bytes =
385 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
386 vap->va_type = ap->a_vp->v_type;
387 vap->va_filerev = dep->de_modrev;
388 return (0);
389}
390
391static int
392msdosfs_setattr(ap)
393 struct vop_setattr_args /* {
394 struct vnode *a_vp;
395 struct vattr *a_vap;
396 struct ucred *a_cred;
397 struct proc *a_p;
398 } */ *ap;
399{
400 struct vnode *vp = ap->a_vp;
401 struct denode *dep = VTODE(ap->a_vp);
402 struct msdosfsmount *pmp = dep->de_pmp;
403 struct vattr *vap = ap->a_vap;
404 struct ucred *cred = ap->a_cred;
405 int error = 0;
406
407#ifdef MSDOSFS_DEBUG
408 printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n",
409 ap->a_vp, vap, cred, ap->a_p);
410#endif
411
412 /*
413 * Check for unsettable attributes.
414 */
415 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
416 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
417 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
418 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
419#ifdef MSDOSFS_DEBUG
420 printf("msdosfs_setattr(): returning EINVAL\n");
421 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n",
422 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid);
423 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n",
424 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen);
425 printf(" va_uid %x, va_gid %x\n",
426 vap->va_uid, vap->va_gid);
427#endif
428 return (EINVAL);
429 }
430 if (vap->va_flags != VNOVAL) {
431 if (vp->v_mount->mnt_flag & MNT_RDONLY)
432 return (EROFS);
433 if (cred->cr_uid != pmp->pm_uid &&
434 (error = suser_xxx(cred, ap->a_p, PRISON_ROOT)))
435 return (error);
436 /*
437 * We are very inconsistent about handling unsupported
438 * attributes. We ignored the access time and the
439 * read and execute bits. We were strict for the other
440 * attributes.
441 *
442 * Here we are strict, stricter than ufs in not allowing
443 * users to attempt to set SF_SETTABLE bits or anyone to
444 * set unsupported bits. However, we ignore attempts to
445 * set ATTR_ARCHIVE for directories `cp -pr' from a more
446 * sensible file system attempts it a lot.
447 */
448 if (cred->cr_uid != 0) {
449 if (vap->va_flags & SF_SETTABLE)
450 return EPERM;
451 }
452 if (vap->va_flags & ~SF_ARCHIVED)
453 return EOPNOTSUPP;
454 if (vap->va_flags & SF_ARCHIVED)
455 dep->de_Attributes &= ~ATTR_ARCHIVE;
456 else if (!(dep->de_Attributes & ATTR_DIRECTORY))
457 dep->de_Attributes |= ATTR_ARCHIVE;
458 dep->de_flag |= DE_MODIFIED;
459 }
460
461 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
462 uid_t uid;
463 gid_t gid;
464
465 if (vp->v_mount->mnt_flag & MNT_RDONLY)
466 return (EROFS);
467 uid = vap->va_uid;
468 if (uid == (uid_t)VNOVAL)
469 uid = pmp->pm_uid;
470 gid = vap->va_gid;
471 if (gid == (gid_t)VNOVAL)
472 gid = pmp->pm_gid;
473 if ((cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid ||
474 (gid != pmp->pm_gid && !groupmember(gid, cred))) &&
475 (error = suser_xxx(cred, ap->a_p, PRISON_ROOT)))
476 return error;
477 if (uid != pmp->pm_uid || gid != pmp->pm_gid)
478 return EINVAL;
479 }
480
481 if (vap->va_size != VNOVAL) {
482 /*
483 * Disallow write attempts on read-only file systems;
484 * unless the file is a socket, fifo, or a block or
485 * character device resident on the file system.
486 */
487 switch (vp->v_type) {
488 case VDIR:
489 return (EISDIR);
490 /* NOT REACHED */
491 case VLNK:
492 case VREG:
493 if (vp->v_mount->mnt_flag & MNT_RDONLY)
494 return (EROFS);
495 break;
496 default:
497 break;
498 }
499 error = detrunc(dep, vap->va_size, 0, cred, ap->a_p);
500 if (error)
501 return error;
502 }
503 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
504 if (vp->v_mount->mnt_flag & MNT_RDONLY)
505 return (EROFS);
506 if (cred->cr_uid != pmp->pm_uid &&
507 (error = suser_xxx(cred, ap->a_p, PRISON_ROOT)) &&
508 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
509 (error = VOP_ACCESS(ap->a_vp, VWRITE, cred, ap->a_p))))
510 return (error);
511 if (vp->v_type != VDIR) {
512 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 &&
513 vap->va_atime.tv_sec != VNOVAL)
514 unix2dostime(&vap->va_atime, &dep->de_ADate, NULL, NULL);
515 if (vap->va_mtime.tv_sec != VNOVAL)
516 unix2dostime(&vap->va_mtime, &dep->de_MDate, &dep->de_MTime, NULL);
517 dep->de_Attributes |= ATTR_ARCHIVE;
518 dep->de_flag |= DE_MODIFIED;
519 }
520 }
521 /*
522 * DOS files only have the ability to have their writability
523 * attribute set, so we use the owner write bit to set the readonly
524 * attribute.
525 */
526 if (vap->va_mode != (mode_t)VNOVAL) {
527 if (vp->v_mount->mnt_flag & MNT_RDONLY)
528 return (EROFS);
529 if (cred->cr_uid != pmp->pm_uid &&
530 (error = suser_xxx(cred, ap->a_p, PRISON_ROOT)))
531 return (error);
532 if (vp->v_type != VDIR) {
533 /* We ignore the read and execute bits. */
534 if (vap->va_mode & VWRITE)
535 dep->de_Attributes &= ~ATTR_READONLY;
536 else
537 dep->de_Attributes |= ATTR_READONLY;
538 dep->de_flag |= DE_MODIFIED;
539 }
540 }
541 return (deupdat(dep, 1));
542}
543
544static int
545msdosfs_read(ap)
546 struct vop_read_args /* {
547 struct vnode *a_vp;
548 struct uio *a_uio;
549 int a_ioflag;
550 struct ucred *a_cred;
551 } */ *ap;
552{
553 int error = 0;
554 int diff;
555 int blsize;
556 int isadir;
557 long n;
558 long on;
559 daddr_t lbn;
560 daddr_t rablock;
561 int rasize;
562 struct buf *bp;
563 struct vnode *vp = ap->a_vp;
564 struct denode *dep = VTODE(vp);
565 struct msdosfsmount *pmp = dep->de_pmp;
566 struct uio *uio = ap->a_uio;
567
568 /*
569 * If they didn't ask for any data, then we are done.
570 */
571 if (uio->uio_resid == 0)
572 return (0);
573 if (uio->uio_offset < 0)
574 return (EINVAL);
575
576 isadir = dep->de_Attributes & ATTR_DIRECTORY;
577 do {
578 lbn = de_cluster(pmp, uio->uio_offset);
579 on = uio->uio_offset & pmp->pm_crbomask;
580 n = min((u_long) (pmp->pm_bpcluster - on), uio->uio_resid);
581 diff = dep->de_FileSize - uio->uio_offset;
582 if (diff <= 0)
583 return (0);
584 if (diff < n)
585 n = diff;
586 /* convert cluster # to block # if a directory */
587 if (isadir) {
588 error = pcbmap(dep, lbn, &lbn, 0, &blsize);
589 if (error)
590 return (error);
591 }
592 /*
593 * If we are operating on a directory file then be sure to
594 * do i/o with the vnode for the filesystem instead of the
595 * vnode for the directory.
596 */
597 if (isadir) {
598 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp);
599 } else {
600 rablock = lbn + 1;
601 if (vp->v_lastr + 1 == lbn &&
602 de_cn2off(pmp, rablock) < dep->de_FileSize) {
603 rasize = pmp->pm_bpcluster;
604 error = breadn(vp, lbn, pmp->pm_bpcluster,
605 &rablock, &rasize, 1, NOCRED, &bp);
606 } else
607 error = bread(vp, lbn, pmp->pm_bpcluster,
608 NOCRED, &bp);
609 vp->v_lastr = lbn;
610 }
611 n = min(n, pmp->pm_bpcluster - bp->b_resid);
612 if (error) {
613 brelse(bp);
614 return (error);
615 }
616 error = uiomove(bp->b_data + on, (int) n, uio);
617 brelse(bp);
618 } while (error == 0 && uio->uio_resid > 0 && n != 0);
619 if (!isadir && !(vp->v_mount->mnt_flag & MNT_NOATIME))
620 dep->de_flag |= DE_ACCESS;
621 return (error);
622}
623
624/*
625 * Write data to a file or directory.
626 */
627static int
628msdosfs_write(ap)
629 struct vop_write_args /* {
630 struct vnode *a_vp;
631 struct uio *a_uio;
632 int a_ioflag;
633 struct ucred *a_cred;
634 } */ *ap;
635{
636 int n;
637 int croffset;
638 int resid;
639 u_long osize;
640 int error = 0;
641 u_long count;
642 daddr_t bn, lastcn;
643 struct buf *bp;
644 int ioflag = ap->a_ioflag;
645 struct uio *uio = ap->a_uio;
646 struct proc *p = uio->uio_procp;
647 struct vnode *vp = ap->a_vp;
648 struct vnode *thisvp;
649 struct denode *dep = VTODE(vp);
650 struct msdosfsmount *pmp = dep->de_pmp;
651 struct ucred *cred = ap->a_cred;
652
653#ifdef MSDOSFS_DEBUG
654 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
655 vp, uio, ioflag, cred);
656 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
657 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
658#endif
659
660 switch (vp->v_type) {
661 case VREG:
662 if (ioflag & IO_APPEND)
663 uio->uio_offset = dep->de_FileSize;
664 thisvp = vp;
665 break;
666 case VDIR:
667 return EISDIR;
668 default:
669 panic("msdosfs_write(): bad file type");
670 }
671
672 if (uio->uio_offset < 0)
673 return (EINVAL);
674
675 if (uio->uio_resid == 0)
676 return (0);
677
678 /*
679 * If they've exceeded their filesize limit, tell them about it.
680 */
681 if (p &&
682 ((uio->uio_offset + uio->uio_resid) >
683 p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) {
684 psignal(p, SIGXFSZ);
685 return (EFBIG);
686 }
687
688 /*
689 * If the offset we are starting the write at is beyond the end of
690 * the file, then they've done a seek. Unix filesystems allow
691 * files with holes in them, DOS doesn't so we must fill the hole
692 * with zeroed blocks.
693 */
694 if (uio->uio_offset > dep->de_FileSize) {
695 error = deextend(dep, uio->uio_offset, cred);
696 if (error)
697 return (error);
698 }
699
700 /*
701 * Remember some values in case the write fails.
702 */
703 resid = uio->uio_resid;
704 osize = dep->de_FileSize;
705
706 /*
707 * If we write beyond the end of the file, extend it to its ultimate
708 * size ahead of the time to hopefully get a contiguous area.
709 */
710 if (uio->uio_offset + resid > osize) {
711 count = de_clcount(pmp, uio->uio_offset + resid) -
712 de_clcount(pmp, osize);
713 error = extendfile(dep, count, NULL, NULL, 0);
714 if (error && (error != ENOSPC || (ioflag & IO_UNIT)))
715 goto errexit;
716 lastcn = dep->de_fc[FC_LASTFC].fc_frcn;
717 } else
718 lastcn = de_clcount(pmp, osize) - 1;
719
720 do {
721 if (de_cluster(pmp, uio->uio_offset) > lastcn) {
722 error = ENOSPC;
723 break;
724 }
725
726 croffset = uio->uio_offset & pmp->pm_crbomask;
727 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset);
728 if (uio->uio_offset + n > dep->de_FileSize) {
729 dep->de_FileSize = uio->uio_offset + n;
730 /* The object size needs to be set before buffer is allocated */
731 vnode_pager_setsize(vp, dep->de_FileSize);
732 }
733
734 bn = de_cluster(pmp, uio->uio_offset);
735 if ((uio->uio_offset & pmp->pm_crbomask) == 0
736 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid)
737 > de_cluster(pmp, uio->uio_offset)
738 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) {
739 /*
740 * If either the whole cluster gets written,
741 * or we write the cluster from its start beyond EOF,
742 * then no need to read data from disk.
743 */
744 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0);
745 clrbuf(bp);
746 /*
747 * Do the bmap now, since pcbmap needs buffers
748 * for the fat table. (see msdosfs_strategy)
749 */
750 if (bp->b_blkno == bp->b_lblkno) {
751 error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno,
752 0, 0);
753 if (error)
754 bp->b_blkno = -1;
755 }
756 if (bp->b_blkno == -1) {
757 brelse(bp);
758 if (!error)
759 error = EIO; /* XXX */
760 break;
761 }
762 } else {
763 /*
764 * The block we need to write into exists, so read it in.
765 */
766 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp);
767 if (error) {
768 brelse(bp);
769 break;
770 }
771 }
772
773 /*
774 * Should these vnode_pager_* functions be done on dir
775 * files?
776 */
777
778 /*
779 * Copy the data from user space into the buf header.
780 */
781 error = uiomove(bp->b_data + croffset, n, uio);
782
783 /*
784 * If they want this synchronous then write it and wait for
785 * it. Otherwise, if on a cluster boundary write it
786 * asynchronously so we can move on to the next block
787 * without delay. Otherwise do a delayed write because we
788 * may want to write somemore into the block later.
789 */
790 if (ioflag & IO_SYNC)
791 (void) bwrite(bp);
792 else if (n + croffset == pmp->pm_bpcluster)
793 bawrite(bp);
794 else
795 bdwrite(bp);
796 dep->de_flag |= DE_UPDATE;
797 } while (error == 0 && uio->uio_resid > 0);
798
799 /*
800 * If the write failed and they want us to, truncate the file back
801 * to the size it was before the write was attempted.
802 */
803errexit:
804 if (error) {
805 if (ioflag & IO_UNIT) {
806 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL);
807 uio->uio_offset -= resid - uio->uio_resid;
808 uio->uio_resid = resid;
809 } else {
810 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL);
811 if (uio->uio_resid != resid)
812 error = 0;
813 }
814 } else if (ioflag & IO_SYNC)
815 error = deupdat(dep, 1);
816 return (error);
817}
818
819/*
820 * Flush the blocks of a file to disk.
821 *
822 * This function is worthless for vnodes that represent directories. Maybe we
823 * could just do a sync if they try an fsync on a directory file.
824 */
825static int
826msdosfs_fsync(ap)
827 struct vop_fsync_args /* {
828 struct vnode *a_vp;
829 struct ucred *a_cred;
830 int a_waitfor;
831 struct proc *a_p;
832 } */ *ap;
833{
834 struct vnode *vp = ap->a_vp;
835 int s;
836 struct buf *bp, *nbp;
837
838 /*
839 * Flush all dirty buffers associated with a vnode.
840 */
841loop:
842 s = splbio();
843 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
844 nbp = TAILQ_NEXT(bp, b_vnbufs);
845 if ((bp->b_flags & B_BUSY))
846 continue;
847 if ((bp->b_flags & B_DELWRI) == 0)
848 panic("msdosfs_fsync: not dirty");
849 bremfree(bp);
850 bp->b_flags |= B_BUSY;
851 splx(s);
852 (void) bwrite(bp);
853 goto loop;
854 }
855 while (vp->v_numoutput) {
856 vp->v_flag |= VBWAIT;
857 (void) tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "msdosfsn", 0);
858 }
859#ifdef DIAGNOSTIC
860 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) {
861 vprint("msdosfs_fsync: dirty", vp);
862 goto loop;
863 }
864#endif
865 splx(s);
866 return (deupdat(VTODE(vp), ap->a_waitfor == MNT_WAIT));
867}
868
869static int
870msdosfs_remove(ap)
871 struct vop_remove_args /* {
872 struct vnode *a_dvp;
873 struct vnode *a_vp;
874 struct componentname *a_cnp;
875 } */ *ap;
876{
877 struct denode *dep = VTODE(ap->a_vp);
878 struct denode *ddep = VTODE(ap->a_dvp);
879 int error;
880
881 if (ap->a_vp->v_type == VDIR)
882 error = EPERM;
883 else
884 error = removede(ddep, dep);
885#ifdef MSDOSFS_DEBUG
886 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount);
887#endif
888 return (error);
889}
890
891/*
892 * DOS filesystems don't know what links are. But since we already called
893 * msdosfs_lookup() with create and lockparent, the parent is locked so we
894 * have to free it before we return the error.
895 */
896static int
897msdosfs_link(ap)
898 struct vop_link_args /* {
899 struct vnode *a_tdvp;
900 struct vnode *a_vp;
901 struct componentname *a_cnp;
902 } */ *ap;
903{
904 VOP_ABORTOP(ap->a_tdvp, ap->a_cnp);
905 return (EOPNOTSUPP);
906}
907
908/*
909 * Renames on files require moving the denode to a new hash queue since the
910 * denode's location is used to compute which hash queue to put the file
911 * in. Unless it is a rename in place. For example "mv a b".
912 *
913 * What follows is the basic algorithm:
914 *
915 * if (file move) {
916 * if (dest file exists) {
917 * remove dest file
918 * }
919 * if (dest and src in same directory) {
920 * rewrite name in existing directory slot
921 * } else {
922 * write new entry in dest directory
923 * update offset and dirclust in denode
924 * move denode to new hash chain
925 * clear old directory entry
926 * }
927 * } else {
928 * directory move
929 * if (dest directory exists) {
930 * if (dest is not empty) {
931 * return ENOTEMPTY
932 * }
933 * remove dest directory
934 * }
935 * if (dest and src in same directory) {
936 * rewrite name in existing entry
937 * } else {
938 * be sure dest is not a child of src directory
939 * write entry in dest directory
940 * update "." and ".." in moved directory
941 * clear old directory entry for moved directory
942 * }
943 * }
944 *
945 * On entry:
946 * source's parent directory is unlocked
947 * source file or directory is unlocked
948 * destination's parent directory is locked
949 * destination file or directory is locked if it exists
950 *
951 * On exit:
952 * all denodes should be released
953 *
954 * Notes:
955 * I'm not sure how the memory containing the pathnames pointed at by the
956 * componentname structures is freed, there may be some memory bleeding
957 * for each rename done.
958 */
959static int
960msdosfs_rename(ap)
961 struct vop_rename_args /* {
962 struct vnode *a_fdvp;
963 struct vnode *a_fvp;
964 struct componentname *a_fcnp;
965 struct vnode *a_tdvp;
966 struct vnode *a_tvp;
967 struct componentname *a_tcnp;
968 } */ *ap;
969{
970 struct vnode *tdvp = ap->a_tdvp;
971 struct vnode *fvp = ap->a_fvp;
972 struct vnode *fdvp = ap->a_fdvp;
973 struct vnode *tvp = ap->a_tvp;
974 struct componentname *tcnp = ap->a_tcnp;
975 struct componentname *fcnp = ap->a_fcnp;
976 struct proc *p = fcnp->cn_proc;
977 struct denode *ip, *xp, *dp, *zp;
978 u_char toname[11], oldname[11];
979 u_long from_diroffset, to_diroffset;
980 u_char to_count;
981 int doingdirectory = 0, newparent = 0;
982 int error;
983 u_long cn;
984 daddr_t bn;
985 struct denode *fddep; /* from file's parent directory */
986 struct denode *fdep; /* from file or directory */
987 struct denode *tddep; /* to file's parent directory */
988 struct denode *tdep; /* to file or directory */
989 struct msdosfsmount *pmp;
990 struct direntry *dotdotp;
991 struct buf *bp;
992
993 fddep = VTODE(ap->a_fdvp);
994 fdep = VTODE(ap->a_fvp);
995 tddep = VTODE(ap->a_tdvp);
996 tdep = tvp ? VTODE(tvp) : NULL;
997 pmp = fddep->de_pmp;
998
999 pmp = VFSTOMSDOSFS(fdvp->v_mount);
1000
1001#ifdef DIAGNOSTIC
1002 if ((tcnp->cn_flags & HASBUF) == 0 ||
1003 (fcnp->cn_flags & HASBUF) == 0)
1004 panic("msdosfs_rename: no name");
1005#endif
1006 /*
1007 * Check for cross-device rename.
1008 */
1009 if ((fvp->v_mount != tdvp->v_mount) ||
1010 (tvp && (fvp->v_mount != tvp->v_mount))) {
1011 error = EXDEV;
1012abortit:
1013 VOP_ABORTOP(tdvp, tcnp);
1014 if (tdvp == tvp)
1015 vrele(tdvp);
1016 else
1017 vput(tdvp);
1018 if (tvp)
1019 vput(tvp);
1020 VOP_ABORTOP(fdvp, fcnp);
1021 vrele(fdvp);
1022 vrele(fvp);
1023 return (error);
1024 }
1025
1026 /*
1027 * If source and dest are the same, do nothing.
1028 */
1029 if (tvp == fvp) {
1030 error = 0;
1031 goto abortit;
1032 }
1033
1034 error = vn_lock(fvp, LK_EXCLUSIVE, p);
1035 if (error)
1036 goto abortit;
1037 dp = VTODE(fdvp);
1038 ip = VTODE(fvp);
1039
1040 /*
1041 * Be sure we are not renaming ".", "..", or an alias of ".". This
1042 * leads to a crippled directory tree. It's pretty tough to do a
1043 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
1044 * doesn't work if the ".." entry is missing.
1045 */
1046 if (ip->de_Attributes & ATTR_DIRECTORY) {
1047 /*
1048 * Avoid ".", "..", and aliases of "." for obvious reasons.
1049 */
1050 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
1051 dp == ip ||
1052 (fcnp->cn_flags & ISDOTDOT) ||
1053 (tcnp->cn_flags & ISDOTDOT) ||
1054 (ip->de_flag & DE_RENAME)) {
1055 VOP_UNLOCK(fvp, 0, p);
1056 error = EINVAL;
1057 goto abortit;
1058 }
1059 ip->de_flag |= DE_RENAME;
1060 doingdirectory++;
1061 }
1062
1063 /*
1064 * When the target exists, both the directory
1065 * and target vnodes are returned locked.
1066 */
1067 dp = VTODE(tdvp);
1068 xp = tvp ? VTODE(tvp) : NULL;
1069 /*
1070 * Remember direntry place to use for destination
1071 */
1072 to_diroffset = dp->de_fndoffset;
1073 to_count = dp->de_fndcnt;
1074
1075 /*
1076 * If ".." must be changed (ie the directory gets a new
1077 * parent) then the source directory must not be in the
1078 * directory heirarchy above the target, as this would
1079 * orphan everything below the source directory. Also
1080 * the user must have write permission in the source so
1081 * as to be able to change "..". We must repeat the call
1082 * to namei, as the parent directory is unlocked by the
1083 * call to doscheckpath().
1084 */
1085 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc);
1086 VOP_UNLOCK(fvp, 0, p);
1087 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
1088 newparent = 1;
1089 vrele(fdvp);
1090 if (doingdirectory && newparent) {
1091 if (error) /* write access check above */
1092 goto bad;
1093 if (xp != NULL)
1094 vput(tvp);
1095 /*
1096 * doscheckpath() vput()'s dp,
1097 * so we have to do a relookup afterwards
1098 */
1099 error = doscheckpath(ip, dp);
1100 if (error)
1101 goto out;
1102 if ((tcnp->cn_flags & SAVESTART) == 0)
1103 panic("msdosfs_rename: lost to startdir");
1104 error = relookup(tdvp, &tvp, tcnp);
1105 if (error)
1106 goto out;
1107 dp = VTODE(tdvp);
1108 xp = tvp ? VTODE(tvp) : NULL;
1109 }
1110
1111 if (xp != NULL) {
1112 /*
1113 * Target must be empty if a directory and have no links
1114 * to it. Also, ensure source and target are compatible
1115 * (both directories, or both not directories).
1116 */
1117 if (xp->de_Attributes & ATTR_DIRECTORY) {
1118 if (!dosdirempty(xp)) {
1119 error = ENOTEMPTY;
1120 goto bad;
1121 }
1122 if (!doingdirectory) {
1123 error = ENOTDIR;
1124 goto bad;
1125 }
1126 cache_purge(tdvp);
1127 } else if (doingdirectory) {
1128 error = EISDIR;
1129 goto bad;
1130 }
1131 error = removede(dp, xp);
1132 if (error)
1133 goto bad;
1134 vput(tvp);
1135 xp = NULL;
1136 }
1137
1138 /*
1139 * Convert the filename in tcnp into a dos filename. We copy this
1140 * into the denode and directory entry for the destination
1141 * file/directory.
1142 */
1143 error = uniqdosname(VTODE(tdvp), tcnp, toname);
1144 if (error)
1145 goto abortit;
1146
1147 /*
1148 * Since from wasn't locked at various places above,
1149 * have to do a relookup here.
1150 */
1151 fcnp->cn_flags &= ~MODMASK;
1152 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1153 if ((fcnp->cn_flags & SAVESTART) == 0)
1154 panic("msdosfs_rename: lost from startdir");
1155 if (!newparent)
1156 VOP_UNLOCK(tdvp, 0, p);
1157 (void) relookup(fdvp, &fvp, fcnp);
1158 if (fvp == NULL) {
1159 /*
1160 * From name has disappeared.
1161 */
1162 if (doingdirectory)
1163 panic("rename: lost dir entry");
1164 vrele(ap->a_fvp);
1165 if (newparent)
1166 VOP_UNLOCK(tdvp, 0, p);
1167 vrele(tdvp);
1168 return 0;
1169 }
1170 xp = VTODE(fvp);
1171 zp = VTODE(fdvp);
1172 from_diroffset = zp->de_fndoffset;
1173
1174 /*
1175 * Ensure that the directory entry still exists and has not
1176 * changed till now. If the source is a file the entry may
1177 * have been unlinked or renamed. In either case there is
1178 * no further work to be done. If the source is a directory
1179 * then it cannot have been rmdir'ed or renamed; this is
1180 * prohibited by the DE_RENAME flag.
1181 */
1182 if (xp != ip) {
1183 if (doingdirectory)
1184 panic("rename: lost dir entry");
1185 vrele(ap->a_fvp);
1186 VOP_UNLOCK(fvp, 0, p);
1187 if (newparent)
1188 VOP_UNLOCK(fdvp, 0, p);
1189 xp = NULL;
1190 } else {
1191 vrele(fvp);
1192 xp = NULL;
1193
1194 /*
1195 * First write a new entry in the destination
1196 * directory and mark the entry in the source directory
1197 * as deleted. Then move the denode to the correct hash
1198 * chain for its new location in the filesystem. And, if
1199 * we moved a directory, then update its .. entry to point
1200 * to the new parent directory.
1201 */
1202 bcopy(ip->de_Name, oldname, 11);
1203 bcopy(toname, ip->de_Name, 11); /* update denode */
1204 dp->de_fndoffset = to_diroffset;
1205 dp->de_fndcnt = to_count;
1206 error = createde(ip, dp, (struct denode **)0, tcnp);
1207 if (error) {
1208 bcopy(oldname, ip->de_Name, 11);
1209 if (newparent)
1210 VOP_UNLOCK(fdvp, 0, p);
1211 VOP_UNLOCK(fvp, 0, p);
1212 goto bad;
1213 }
1214 ip->de_refcnt++;
1215 zp->de_fndoffset = from_diroffset;
1216 error = removede(zp, ip);
1217 if (error) {
1218 /* XXX should really panic here, fs is corrupt */
1219 if (newparent)
1220 VOP_UNLOCK(fdvp, 0, p);
1221 VOP_UNLOCK(fvp, 0, p);
1222 goto bad;
1223 }
1224 if (!doingdirectory) {
1225 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0,
1226 &ip->de_dirclust, 0);
1227 if (error) {
1228 /* XXX should really panic here, fs is corrupt */
1229 if (newparent)
1230 VOP_UNLOCK(fdvp, 0, p);
1231 VOP_UNLOCK(fvp, 0, p);
1232 goto bad;
1233 }
1234 if (ip->de_dirclust == MSDOSFSROOT)
1235 ip->de_diroffset = to_diroffset;
1236 else
1237 ip->de_diroffset = to_diroffset & pmp->pm_crbomask;
1238 }
1239 reinsert(ip);
1240 if (newparent)
1241 VOP_UNLOCK(fdvp, 0, p);
1242 }
1243
1244 /*
1245 * If we moved a directory to a new parent directory, then we must
1246 * fixup the ".." entry in the moved directory.
1247 */
1248 if (doingdirectory && newparent) {
1249 cn = ip->de_StartCluster;
1250 if (cn == MSDOSFSROOT) {
1251 /* this should never happen */
1252 panic("msdosfs_rename(): updating .. in root directory?");
1253 } else
1254 bn = cntobn(pmp, cn);
1255 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
1256 NOCRED, &bp);
1257 if (error) {
1258 /* XXX should really panic here, fs is corrupt */
1259 brelse(bp);
1260 VOP_UNLOCK(fvp, 0, p);
1261 goto bad;
1262 }
1263 dotdotp = (struct direntry *)bp->b_data + 1;
1264 putushort(dotdotp->deStartCluster, dp->de_StartCluster);
1265 if (FAT32(pmp))
1266 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16);
1267 error = bwrite(bp);
1268 if (error) {
1269 /* XXX should really panic here, fs is corrupt */
1270 VOP_UNLOCK(fvp, 0, p);
1271 goto bad;
1272 }
1273 }
1274
1275 VOP_UNLOCK(fvp, 0, p);
1276bad:
1277 if (xp)
1278 vput(tvp);
1279 vput(tdvp);
1280out:
1281 ip->de_flag &= ~DE_RENAME;
1282 vrele(fdvp);
1283 vrele(fvp);
1284 return (error);
1285
1286}
1287
1288static struct {
1289 struct direntry dot;
1290 struct direntry dotdot;
1291} dosdirtemplate = {
1292 { ". ", " ", /* the . entry */
1293 ATTR_DIRECTORY, /* file attribute */
1294 0, /* reserved */
1295 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1296 { 0, 0 }, /* access date */
1297 { 0, 0 }, /* high bits of start cluster */
1298 { 210, 4 }, { 210, 4 }, /* modify time & date */
1299 { 0, 0 }, /* startcluster */
1300 { 0, 0, 0, 0 } /* filesize */
1301 },
1302 { ".. ", " ", /* the .. entry */
1303 ATTR_DIRECTORY, /* file attribute */
1304 0, /* reserved */
1305 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1306 { 0, 0 }, /* access date */
1307 { 0, 0 }, /* high bits of start cluster */
1308 { 210, 4 }, { 210, 4 }, /* modify time & date */
1309 { 0, 0 }, /* startcluster */
1310 { 0, 0, 0, 0 } /* filesize */
1311 }
1312};
1313
1314static int
1315msdosfs_mkdir(ap)
1316 struct vop_mkdir_args /* {
1317 struct vnode *a_dvp;
1318 struvt vnode **a_vpp;
1319 struvt componentname *a_cnp;
1320 struct vattr *a_vap;
1321 } */ *ap;
1322{
1323 struct componentname *cnp = ap->a_cnp;
1324 struct denode *dep;
1325 struct denode *pdep = VTODE(ap->a_dvp);
1326 struct direntry *denp;
1327 struct msdosfsmount *pmp = pdep->de_pmp;
1328 struct buf *bp;
1329 u_long newcluster, pcl;
1330 int bn;
1331 int error;
1332 struct denode ndirent;
1333 struct timespec ts;
1334
1335 /*
1336 * If this is the root directory and there is no space left we
1337 * can't do anything. This is because the root directory can not
1338 * change size.
1339 */
1340 if (pdep->de_StartCluster == MSDOSFSROOT
1341 && pdep->de_fndoffset >= pdep->de_FileSize) {
1342 error = ENOSPC;
1343 goto bad2;
1344 }
1345
1346 /*
1347 * Allocate a cluster to hold the about to be created directory.
1348 */
1349 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL);
1350 if (error)
1351 goto bad2;
1352
1353 bzero(&ndirent, sizeof(ndirent));
1354 ndirent.de_pmp = pmp;
1355 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1356 getnanotime(&ts);
1357 DETIMES(&ndirent, &ts, &ts, &ts);
1358
1359 /*
1360 * Now fill the cluster with the "." and ".." entries. And write
1361 * the cluster to disk. This way it is there for the parent
1362 * directory to be pointing at if there were a crash.
1363 */
1364 bn = cntobn(pmp, newcluster);
1365 /* always succeeds */
1366 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0);
1367 bzero(bp->b_data, pmp->pm_bpcluster);
1368 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate);
1369 denp = (struct direntry *)bp->b_data;
1370 putushort(denp[0].deStartCluster, newcluster);
1371 putushort(denp[0].deCDate, ndirent.de_CDate);
1372 putushort(denp[0].deCTime, ndirent.de_CTime);
1373 denp[0].deCHundredth = ndirent.de_CHun;
1374 putushort(denp[0].deADate, ndirent.de_ADate);
1375 putushort(denp[0].deMDate, ndirent.de_MDate);
1376 putushort(denp[0].deMTime, ndirent.de_MTime);
1377 pcl = pdep->de_StartCluster;
1378 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1379 pcl = 0;
1380 putushort(denp[1].deStartCluster, pcl);
1381 putushort(denp[1].deCDate, ndirent.de_CDate);
1382 putushort(denp[1].deCTime, ndirent.de_CTime);
1383 denp[1].deCHundredth = ndirent.de_CHun;
1384 putushort(denp[1].deADate, ndirent.de_ADate);
1385 putushort(denp[1].deMDate, ndirent.de_MDate);
1386 putushort(denp[1].deMTime, ndirent.de_MTime);
1387 if (FAT32(pmp)) {
1388 putushort(denp[0].deHighClust, newcluster >> 16);
1389 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16);
1390 }
1391
1392 error = bwrite(bp);
1393 if (error)
1394 goto bad;
1395
1396 /*
1397 * Now build up a directory entry pointing to the newly allocated
1398 * cluster. This will be written to an empty slot in the parent
1399 * directory.
1400 */
1401#ifdef DIAGNOSTIC
1402 if ((cnp->cn_flags & HASBUF) == 0)
1403 panic("msdosfs_mkdir: no name");
1404#endif
1405 error = uniqdosname(pdep, cnp, ndirent.de_Name);
1406 if (error)
1407 goto bad;
1408
1409 ndirent.de_Attributes = ATTR_DIRECTORY;
1410 ndirent.de_LowerCase = 0;
1411 ndirent.de_StartCluster = newcluster;
1412 ndirent.de_FileSize = 0;
1413 ndirent.de_dev = pdep->de_dev;
1414 ndirent.de_devvp = pdep->de_devvp;
1415 error = createde(&ndirent, pdep, &dep, cnp);
1416 if (error)
1417 goto bad;
1418 if ((cnp->cn_flags & SAVESTART) == 0)
1419 zfree(namei_zone, cnp->cn_pnbuf);
1420 *ap->a_vpp = DETOV(dep);
1421 return (0);
1422
1423bad:
1424 clusterfree(pmp, newcluster, NULL);
1425bad2:
1426 zfree(namei_zone, cnp->cn_pnbuf);
1427 return (error);
1428}
1429
1430static int
1431msdosfs_rmdir(ap)
1432 struct vop_rmdir_args /* {
1433 struct vnode *a_dvp;
1434 struct vnode *a_vp;
1435 struct componentname *a_cnp;
1436 } */ *ap;
1437{
1438 register struct vnode *vp = ap->a_vp;
1439 register struct vnode *dvp = ap->a_dvp;
1440 register struct componentname *cnp = ap->a_cnp;
1441 register struct denode *ip, *dp;
1442 struct proc *p = cnp->cn_proc;
1443 int error;
1444
1445 ip = VTODE(vp);
1446 dp = VTODE(dvp);
1447
1448 /*
1449 * Verify the directory is empty (and valid).
1450 * (Rmdir ".." won't be valid since
1451 * ".." will contain a reference to
1452 * the current directory and thus be
1453 * non-empty.)
1454 */
1455 error = 0;
1456 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) {
1457 error = ENOTEMPTY;
1458 goto out;
1459 }
1460 /*
1461 * Delete the entry from the directory. For dos filesystems this
1462 * gets rid of the directory entry on disk, the in memory copy
1463 * still exists but the de_refcnt is <= 0. This prevents it from
1464 * being found by deget(). When the vput() on dep is done we give
1465 * up access and eventually msdosfs_reclaim() will be called which
1466 * will remove it from the denode cache.
1467 */
1468 error = removede(dp, ip);
1469 if (error)
1470 goto out;
1471 /*
1472 * This is where we decrement the link count in the parent
1473 * directory. Since dos filesystems don't do this we just purge
1474 * the name cache.
1475 */
1476 cache_purge(dvp);
1477 VOP_UNLOCK(dvp, 0, p);
1478 /*
1479 * Truncate the directory that is being deleted.
1480 */
1481 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, p);
1482 cache_purge(vp);
1483
1484 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, p);
1485out:
1486 return (error);
1487}
1488
1489/*
1490 * DOS filesystems don't know what symlinks are.
1491 */
1492static int
1493msdosfs_symlink(ap)
1494 struct vop_symlink_args /* {
1495 struct vnode *a_dvp;
1496 struct vnode **a_vpp;
1497 struct componentname *a_cnp;
1498 struct vattr *a_vap;
1499 char *a_target;
1500 } */ *ap;
1501{
1502 zfree(namei_zone, ap->a_cnp->cn_pnbuf);
1503 /* VOP_ABORTOP(ap->a_dvp, ap->a_cnp); ??? */
1504 return (EOPNOTSUPP);
1505}
1506
1507static int
1508msdosfs_readdir(ap)
1509 struct vop_readdir_args /* {
1510 struct vnode *a_vp;
1511 struct uio *a_uio;
1512 struct ucred *a_cred;
1513 int *a_eofflag;
1514 int *a_ncookies;
1515 u_long **a_cookies;
1516 } */ *ap;
1517{
1518 int error = 0;
1519 int diff;
1520 long n;
1521 int blsize;
1522 long on;
1523 u_long cn;
1524 u_long fileno;
1525 u_long dirsperblk;
1526 long bias = 0;
1527 daddr_t bn, lbn;
1528 struct buf *bp;
1529 struct denode *dep = VTODE(ap->a_vp);
1530 struct msdosfsmount *pmp = dep->de_pmp;
1531 struct direntry *dentp;
1532 struct dirent dirbuf;
1533 struct uio *uio = ap->a_uio;
1534 u_long *cookies = NULL;
1535 int ncookies = 0;
1536 off_t offset, off;
1537 int chksum = -1;
1538
1539#ifdef MSDOSFS_DEBUG
1540 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
1541 ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
1542#endif
1543
1544 /*
1545 * msdosfs_readdir() won't operate properly on regular files since
1546 * it does i/o only with the the filesystem vnode, and hence can
1547 * retrieve the wrong block from the buffer cache for a plain file.
1548 * So, fail attempts to readdir() on a plain file.
1549 */
1550 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
1551 return (ENOTDIR);
1552
1553 /*
1554 * To be safe, initialize dirbuf
1555 */
1556 bzero(dirbuf.d_name, sizeof(dirbuf.d_name));
1557
1558 /*
1559 * If the user buffer is smaller than the size of one dos directory
1560 * entry or the file offset is not a multiple of the size of a
1561 * directory entry, then we fail the read.
1562 */
1563 off = offset = uio->uio_offset;
1564 if (uio->uio_resid < sizeof(struct direntry) ||
1565 (offset & (sizeof(struct direntry) - 1)))
1566 return (EINVAL);
1567
1568 if (ap->a_ncookies) {
1569 ncookies = uio->uio_resid / 16;
1570 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP,
1571 M_WAITOK);
1572 *ap->a_cookies = cookies;
1573 *ap->a_ncookies = ncookies;
1574 }
1575
1576 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1577
1578 /*
1579 * If they are reading from the root directory then, we simulate
1580 * the . and .. entries since these don't exist in the root
1581 * directory. We also set the offset bias to make up for having to
1582 * simulate these entries. By this I mean that at file offset 64 we
1583 * read the first entry in the root directory that lives on disk.
1584 */
1585 if (dep->de_StartCluster == MSDOSFSROOT
1586 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
1587#if 0
1588 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n",
1589 offset);
1590#endif
1591 bias = 2 * sizeof(struct direntry);
1592 if (offset < bias) {
1593 for (n = (int)offset / sizeof(struct direntry);
1594 n < 2; n++) {
1595 if (FAT32(pmp))
1596 dirbuf.d_fileno = cntobn(pmp,
1597 pmp->pm_rootdirblk)
1598 * dirsperblk;
1599 else
1600 dirbuf.d_fileno = 1;
1601 dirbuf.d_type = DT_DIR;
1602 switch (n) {
1603 case 0:
1604 dirbuf.d_namlen = 1;
1605 strcpy(dirbuf.d_name, ".");
1606 break;
1607 case 1:
1608 dirbuf.d_namlen = 2;
1609 strcpy(dirbuf.d_name, "..");
1610 break;
1611 }
1612 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1613 if (uio->uio_resid < dirbuf.d_reclen)
1614 goto out;
1615 error = uiomove((caddr_t) &dirbuf,
1616 dirbuf.d_reclen, uio);
1617 if (error)
1618 goto out;
1619 offset += sizeof(struct direntry);
1620 off = offset;
1621 if (cookies) {
1622 *cookies++ = offset;
1623 if (--ncookies <= 0)
1624 goto out;
1625 }
1626 }
1627 }
1628 }
1629
1630 off = offset;
1631 while (uio->uio_resid > 0) {
1632 lbn = de_cluster(pmp, offset - bias);
1633 on = (offset - bias) & pmp->pm_crbomask;
1634 n = min(pmp->pm_bpcluster - on, uio->uio_resid);
1635 diff = dep->de_FileSize - (offset - bias);
1636 if (diff <= 0)
1637 break;
1638 n = min(n, diff);
1639 error = pcbmap(dep, lbn, &bn, &cn, &blsize);
1640 if (error)
1641 break;
1642 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp);
1643 if (error) {
1644 brelse(bp);
1645 return (error);
1646 }
1647 n = min(n, blsize - bp->b_resid);
1648
1649 /*
1650 * Convert from dos directory entries to fs-independent
1651 * directory entries.
1652 */
1653 for (dentp = (struct direntry *)(bp->b_data + on);
1654 (char *)dentp < bp->b_data + on + n;
1655 dentp++, offset += sizeof(struct direntry)) {
1656#if 0
1657 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
1658 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
1659#endif
1660 /*
1661 * If this is an unused entry, we can stop.
1662 */
1663 if (dentp->deName[0] == SLOT_EMPTY) {
1664 brelse(bp);
1665 goto out;
1666 }
1667 /*
1668 * Skip deleted entries.
1669 */
1670 if (dentp->deName[0] == SLOT_DELETED) {
1671 chksum = -1;
1672 continue;
1673 }
1674
1675 /*
1676 * Handle Win95 long directory entries
1677 */
1678 if (dentp->deAttributes == ATTR_WIN95) {
1679 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
1680 continue;
1681 chksum = win2unixfn((struct winentry *)dentp,
1682 &dirbuf, chksum,
1683 pmp->pm_flags & MSDOSFSMNT_U2WTABLE,
1684 pmp->pm_u2w);
1685 continue;
1686 }
1687
1688 /*
1689 * Skip volume labels
1690 */
1691 if (dentp->deAttributes & ATTR_VOLUME) {
1692 chksum = -1;
1693 continue;
1694 }
1695 /*
1696 * This computation of d_fileno must match
1697 * the computation of va_fileid in
1698 * msdosfs_getattr.
1699 */
1700 if (dentp->deAttributes & ATTR_DIRECTORY) {
1701 fileno = getushort(dentp->deStartCluster);
1702 if (FAT32(pmp))
1703 fileno |= getushort(dentp->deHighClust) << 16;
1704 /* if this is the root directory */
1705 if (fileno == MSDOSFSROOT)
1706 if (FAT32(pmp))
1707 fileno = cntobn(pmp,
1708 pmp->pm_rootdirblk)
1709 * dirsperblk;
1710 else
1711 fileno = 1;
1712 else
1713 fileno = cntobn(pmp, fileno) * dirsperblk;
1714 dirbuf.d_fileno = fileno;
1715 dirbuf.d_type = DT_DIR;
1716 } else {
1717 dirbuf.d_fileno = offset / sizeof(struct direntry);
1718 dirbuf.d_type = DT_REG;
1719 }
1720 if (chksum != winChksum(dentp->deName))
1721 dirbuf.d_namlen = dos2unixfn(dentp->deName,
1722 (u_char *)dirbuf.d_name,
1723 dentp->deLowerCase |
1724 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ?
1725 (LCASE_BASE | LCASE_EXT) : 0),
1726 pmp->pm_flags & MSDOSFSMNT_U2WTABLE,
1727 pmp->pm_d2u,
1728 pmp->pm_flags & MSDOSFSMNT_ULTABLE,
1729 pmp->pm_ul);
1730 else
1731 dirbuf.d_name[dirbuf.d_namlen] = 0;
1732 chksum = -1;
1733 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1734 if (uio->uio_resid < dirbuf.d_reclen) {
1735 brelse(bp);
1736 goto out;
1737 }
1738 error = uiomove((caddr_t) &dirbuf,
1739 dirbuf.d_reclen, uio);
1740 if (error) {
1741 brelse(bp);
1742 goto out;
1743 }
1744 if (cookies) {
1745 *cookies++ = offset + sizeof(struct direntry);
1746 if (--ncookies <= 0) {
1747 brelse(bp);
1748 goto out;
1749 }
1750 }
1751 off = offset + sizeof(struct direntry);
1752 }
1753 brelse(bp);
1754 }
1755out:
1756 /* Subtract unused cookies */
1757 if (ap->a_ncookies)
1758 *ap->a_ncookies -= ncookies;
1759
1760 uio->uio_offset = off;
1761
1762 /*
1763 * Set the eofflag (NFS uses it)
1764 */
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