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/lockf.h>
54#include <sys/namei.h>
55#include <sys/resourcevar.h> /* defines plimit structure in proc struct */
56#include <sys/kernel.h>
57#include <sys/stat.h>
58#include <sys/bio.h>
59#include <sys/buf.h>
60#include <sys/proc.h>
61#include <sys/mount.h>
62#include <sys/unistd.h>
63#include <sys/vnode.h>
64#include <sys/malloc.h>
65#include <sys/dirent.h>
66#include <sys/signalvar.h>
67
68#include <vm/vm.h>
69#include <vm/vm_extern.h>
70#include <vm/vnode_pager.h>
71
72#include <machine/mutex.h>
73
74#include <fs/msdosfs/bpb.h>
75#include <fs/msdosfs/msdosfsmount.h>
76#include <fs/msdosfs/direntry.h>
77#include <fs/msdosfs/denode.h>
78#include <fs/msdosfs/fat.h>
79
80#include "opt_msdosfs.h"
81
82#define DOS_FILESIZE_MAX 0xffffffff
83
84/*
85 * Prototypes for MSDOSFS vnode operations
86 */
87static vop_advlock_t msdosfs_advlock;
88static vop_create_t msdosfs_create;
89static vop_mknod_t msdosfs_mknod;
90static vop_close_t msdosfs_close;
91static vop_access_t msdosfs_access;
92static vop_getattr_t msdosfs_getattr;
93static vop_setattr_t msdosfs_setattr;
94static vop_read_t msdosfs_read;
95static vop_write_t msdosfs_write;
96static vop_fsync_t msdosfs_fsync;
97static vop_remove_t msdosfs_remove;
98static vop_link_t msdosfs_link;
99static vop_rename_t msdosfs_rename;
100static vop_mkdir_t msdosfs_mkdir;
101static vop_rmdir_t msdosfs_rmdir;
102static vop_symlink_t msdosfs_symlink;
103static vop_readdir_t msdosfs_readdir;
104static vop_bmap_t msdosfs_bmap;
105static vop_strategy_t msdosfs_strategy;
106static vop_print_t msdosfs_print;
107static vop_pathconf_t msdosfs_pathconf;
108
109/*
110 * Some general notes:
111 *
112 * In the ufs filesystem the inodes, superblocks, and indirect blocks are
113 * read/written using the vnode for the filesystem. Blocks that represent
114 * the contents of a file are read/written using the vnode for the file
115 * (including directories when they are read/written as files). This
116 * presents problems for the dos filesystem because data that should be in
117 * an inode (if dos had them) resides in the directory itself. Since we
118 * must update directory entries without the benefit of having the vnode
119 * for the directory we must use the vnode for the filesystem. This means
120 * that when a directory is actually read/written (via read, write, or
121 * readdir, or seek) we must use the vnode for the filesystem instead of
122 * the vnode for the directory as would happen in ufs. This is to insure we
123 * retreive the correct block from the buffer cache since the hash value is
124 * based upon the vnode address and the desired block number.
125 */
126
127/*
128 * Create a regular file. On entry the directory to contain the file being
129 * created is locked. We must release before we return. We must also free
130 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or
131 * only if the SAVESTART bit in cn_flags is clear on success.
132 */
133static int
134msdosfs_create(ap)
135 struct vop_create_args /* {
136 struct vnode *a_dvp;
137 struct vnode **a_vpp;
138 struct componentname *a_cnp;
139 struct vattr *a_vap;
140 } */ *ap;
141{
142 struct componentname *cnp = ap->a_cnp;
143 struct denode ndirent;
144 struct denode *dep;
145 struct denode *pdep = VTODE(ap->a_dvp);
146 struct timespec ts;
147 int error;
148
149#ifdef MSDOSFS_DEBUG
150 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap);
151#endif
152
153 /*
154 * If this is the root directory and there is no space left we
155 * can't do anything. This is because the root directory can not
156 * change size.
157 */
158 if (pdep->de_StartCluster == MSDOSFSROOT
159 && pdep->de_fndoffset >= pdep->de_FileSize) {
160 error = ENOSPC;
161 goto bad;
162 }
163
164 /*
165 * Create a directory entry for the file, then call createde() to
166 * have it installed. NOTE: DOS files are always executable. We
167 * use the absence of the owner write bit to make the file
168 * readonly.
169 */
170#ifdef DIAGNOSTIC
171 if ((cnp->cn_flags & HASBUF) == 0)
172 panic("msdosfs_create: no name");
173#endif
174 bzero(&ndirent, sizeof(ndirent));
175 error = uniqdosname(pdep, cnp, ndirent.de_Name);
176 if (error)
177 goto bad;
178
179 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ?
180 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY;
181 ndirent.de_LowerCase = 0;
182 ndirent.de_StartCluster = 0;
183 ndirent.de_FileSize = 0;
184 ndirent.de_dev = pdep->de_dev;
185 ndirent.de_pmp = pdep->de_pmp;
186 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
187 getnanotime(&ts);
188 DETIMES(&ndirent, &ts, &ts, &ts);
189 error = createde(&ndirent, pdep, &dep, cnp);
190 if (error)
191 goto bad;
192 *ap->a_vpp = DETOV(dep);
193 return (0);
194
195bad:
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 return (EINVAL);
209}
210
211static int
212msdosfs_close(ap)
213 struct vop_close_args /* {
214 struct vnode *a_vp;
215 int a_fflag;
216 struct ucred *a_cred;
217 struct thread *a_td;
218 } */ *ap;
219{
220 struct vnode *vp = ap->a_vp;
221 struct denode *dep = VTODE(vp);
222 struct timespec ts;
223
224 VI_LOCK(vp);
225 if (vp->v_usecount > 1) {
226 getnanotime(&ts);
227 DETIMES(dep, &ts, &ts, &ts);
228 }
229 VI_UNLOCK(vp);
230 return 0;
231}
232
233static int
234msdosfs_access(ap)
235 struct vop_access_args /* {
236 struct vnode *a_vp;
237 int a_mode;
238 struct ucred *a_cred;
239 struct thread *a_td;
240 } */ *ap;
241{
242 struct vnode *vp = ap->a_vp;
243 struct denode *dep = VTODE(ap->a_vp);
244 struct msdosfsmount *pmp = dep->de_pmp;
245 mode_t file_mode, mode = ap->a_mode;
246
247 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) |
248 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH));
249 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
250
251 /*
252 * Disallow write attempts on read-only filesystems;
253 * unless the file is a socket, fifo, or a block or
254 * character device resident on the filesystem.
255 */
256 if (mode & VWRITE) {
257 switch (vp->v_type) {
258 case VDIR:
259 case VLNK:
260 case VREG:
261 if (vp->v_mount->mnt_flag & MNT_RDONLY)
262 return (EROFS);
263 break;
264 default:
265 break;
266 }
267 }
268
269 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid,
270 ap->a_mode, ap->a_cred, NULL));
271}
272
273static int
274msdosfs_getattr(ap)
275 struct vop_getattr_args /* {
276 struct vnode *a_vp;
277 struct vattr *a_vap;
278 struct ucred *a_cred;
279 struct thread *a_td;
280 } */ *ap;
281{
282 struct denode *dep = VTODE(ap->a_vp);
283 struct msdosfsmount *pmp = dep->de_pmp;
284 struct vattr *vap = ap->a_vap;
285 mode_t mode;
286 struct timespec ts;
287 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
288 uint64_t fileid;
289
290 getnanotime(&ts);
291 DETIMES(dep, &ts, &ts, &ts);
292 vap->va_fsid = dev2udev(dep->de_dev);
293 /*
294 * The following computation of the fileid must be the same as that
295 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
296 * doesn't work.
297 */
298 if (dep->de_Attributes & ATTR_DIRECTORY) {
299 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) *
300 dirsperblk;
301 if (dep->de_StartCluster == MSDOSFSROOT)
302 fileid = 1;
303 } else {
304 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) *
305 dirsperblk;
306 if (dep->de_dirclust == MSDOSFSROOT)
307 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk;
308 fileid += (uint64_t)dep->de_diroffset / sizeof(struct direntry);
309 }
310#ifdef MSDOSFS_LARGE
311 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid);
312#else
313 vap->va_fileid = (long)fileid;
314#endif
315 if ((dep->de_Attributes & ATTR_READONLY) == 0)
316 mode = S_IRWXU|S_IRWXG|S_IRWXO;
317 else
318 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
319 vap->va_mode = mode &
320 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
321 vap->va_uid = pmp->pm_uid;
322 vap->va_gid = pmp->pm_gid;
323 vap->va_nlink = 1;
324 vap->va_rdev = 0;
325 vap->va_size = dep->de_FileSize;
326 dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime);
327 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
328 dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime);
329 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, &vap->va_ctime);
330 } else {
331 vap->va_atime = vap->va_mtime;
332 vap->va_ctime = vap->va_mtime;
333 }
334 vap->va_flags = 0;
335 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0)
336 vap->va_flags |= SF_ARCHIVED;
337 vap->va_gen = 0;
338 vap->va_blocksize = pmp->pm_bpcluster;
339 vap->va_bytes =
340 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
341 vap->va_type = ap->a_vp->v_type;
342 vap->va_filerev = dep->de_modrev;
343 return (0);
344}
345
346static int
347msdosfs_setattr(ap)
348 struct vop_setattr_args /* {
349 struct vnode *a_vp;
350 struct vattr *a_vap;
351 struct ucred *a_cred;
352 struct thread *a_td;
353 } */ *ap;
354{
355 struct vnode *vp = ap->a_vp;
356 struct denode *dep = VTODE(ap->a_vp);
357 struct msdosfsmount *pmp = dep->de_pmp;
358 struct vattr *vap = ap->a_vap;
359 struct ucred *cred = ap->a_cred;
360 int error = 0;
361
362#ifdef MSDOSFS_DEBUG
363 printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n",
364 ap->a_vp, vap, cred, ap->a_td);
365#endif
366
367 /*
368 * Check for unsettable attributes.
369 */
370 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
371 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
372 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
373 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
374#ifdef MSDOSFS_DEBUG
375 printf("msdosfs_setattr(): returning EINVAL\n");
376 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n",
377 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid);
378 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n",
379 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen);
380 printf(" va_uid %x, va_gid %x\n",
381 vap->va_uid, vap->va_gid);
382#endif
383 return (EINVAL);
384 }
385 if (vap->va_flags != VNOVAL) {
386 if (vp->v_mount->mnt_flag & MNT_RDONLY)
387 return (EROFS);
388 if (cred->cr_uid != pmp->pm_uid &&
389 (error = suser_cred(cred, SUSER_ALLOWJAIL)))
390 return (error);
391 /*
392 * We are very inconsistent about handling unsupported
393 * attributes. We ignored the access time and the
394 * read and execute bits. We were strict for the other
395 * attributes.
396 *
397 * Here we are strict, stricter than ufs in not allowing
398 * users to attempt to set SF_SETTABLE bits or anyone to
399 * set unsupported bits. However, we ignore attempts to
400 * set ATTR_ARCHIVE for directories `cp -pr' from a more
401 * sensible filesystem attempts it a lot.
402 */
403 if (suser_cred(cred, SUSER_ALLOWJAIL)) {
404 if (vap->va_flags & SF_SETTABLE)
405 return EPERM;
406 }
407 if (vap->va_flags & ~SF_ARCHIVED)
408 return EOPNOTSUPP;
409 if (vap->va_flags & SF_ARCHIVED)
410 dep->de_Attributes &= ~ATTR_ARCHIVE;
411 else if (!(dep->de_Attributes & ATTR_DIRECTORY))
412 dep->de_Attributes |= ATTR_ARCHIVE;
413 dep->de_flag |= DE_MODIFIED;
414 }
415
416 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
417 uid_t uid;
418 gid_t gid;
419
420 if (vp->v_mount->mnt_flag & MNT_RDONLY)
421 return (EROFS);
422 uid = vap->va_uid;
423 if (uid == (uid_t)VNOVAL)
424 uid = pmp->pm_uid;
425 gid = vap->va_gid;
426 if (gid == (gid_t)VNOVAL)
427 gid = pmp->pm_gid;
428 if ((cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid ||
429 (gid != pmp->pm_gid && !groupmember(gid, cred))) &&
430 (error = suser_cred(cred, SUSER_ALLOWJAIL)))
431 return error;
432 if (uid != pmp->pm_uid || gid != pmp->pm_gid)
433 return EINVAL;
434 }
435
436 if (vap->va_size != VNOVAL) {
437 /*
438 * Disallow write attempts on read-only filesystems;
439 * unless the file is a socket, fifo, or a block or
440 * character device resident on the filesystem.
441 */
442 switch (vp->v_type) {
443 case VDIR:
444 return (EISDIR);
445 /* NOT REACHED */
446 case VLNK:
447 case VREG:
448 if (vp->v_mount->mnt_flag & MNT_RDONLY)
449 return (EROFS);
450 break;
451 default:
452 break;
453 }
454 error = detrunc(dep, vap->va_size, 0, cred, ap->a_td);
455 if (error)
456 return error;
457 }
458 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
459 if (vp->v_mount->mnt_flag & MNT_RDONLY)
460 return (EROFS);
461 if (cred->cr_uid != pmp->pm_uid &&
462 (error = suser_cred(cred, SUSER_ALLOWJAIL)) &&
463 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
464 (error = VOP_ACCESS(ap->a_vp, VWRITE, cred, ap->a_td))))
465 return (error);
466 if (vp->v_type != VDIR) {
467 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 &&
468 vap->va_atime.tv_sec != VNOVAL) {
469 dep->de_flag &= ~DE_ACCESS;
470 unix2dostime(&vap->va_atime, &dep->de_ADate,
471 NULL, NULL);
472 }
473 if (vap->va_mtime.tv_sec != VNOVAL) {
474 dep->de_flag &= ~DE_UPDATE;
475 unix2dostime(&vap->va_mtime, &dep->de_MDate,
476 &dep->de_MTime, NULL);
477 }
478 dep->de_Attributes |= ATTR_ARCHIVE;
479 dep->de_flag |= DE_MODIFIED;
480 }
481 }
482 /*
483 * DOS files only have the ability to have their writability
484 * attribute set, so we use the owner write bit to set the readonly
485 * attribute.
486 */
487 if (vap->va_mode != (mode_t)VNOVAL) {
488 if (vp->v_mount->mnt_flag & MNT_RDONLY)
489 return (EROFS);
490 if (cred->cr_uid != pmp->pm_uid &&
491 (error = suser_cred(cred, SUSER_ALLOWJAIL)))
492 return (error);
493 if (vp->v_type != VDIR) {
494 /* We ignore the read and execute bits. */
495 if (vap->va_mode & VWRITE)
496 dep->de_Attributes &= ~ATTR_READONLY;
497 else
498 dep->de_Attributes |= ATTR_READONLY;
499 dep->de_Attributes |= ATTR_ARCHIVE;
500 dep->de_flag |= DE_MODIFIED;
501 }
502 }
503 return (deupdat(dep, 1));
504}
505
506static int
507msdosfs_read(ap)
508 struct vop_read_args /* {
509 struct vnode *a_vp;
510 struct uio *a_uio;
511 int a_ioflag;
512 struct ucred *a_cred;
513 } */ *ap;
514{
515 int error = 0;
516 int blsize;
517 int isadir;
518 int orig_resid;
519 u_int n;
520 u_long diff;
521 u_long on;
522 daddr_t lbn;
523 daddr_t rablock;
524 int rasize;
525 int seqcount;
526 struct buf *bp;
527 struct vnode *vp = ap->a_vp;
528 struct denode *dep = VTODE(vp);
529 struct msdosfsmount *pmp = dep->de_pmp;
530 struct uio *uio = ap->a_uio;
531
532 if (uio->uio_offset < 0)
533 return (EINVAL);
534
535 if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX)
536 return (0);
537 /*
538 * If they didn't ask for any data, then we are done.
539 */
540 orig_resid = uio->uio_resid;
541 if (orig_resid <= 0)
542 return (0);
543
544 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
545
546 isadir = dep->de_Attributes & ATTR_DIRECTORY;
547 do {
548 if (uio->uio_offset >= dep->de_FileSize)
549 break;
550 lbn = de_cluster(pmp, uio->uio_offset);
551 /*
552 * If we are operating on a directory file then be sure to
553 * do i/o with the vnode for the filesystem instead of the
554 * vnode for the directory.
555 */
556 if (isadir) {
557 /* convert cluster # to block # */
558 error = pcbmap(dep, lbn, &lbn, 0, &blsize);
559 if (error == E2BIG) {
560 error = EINVAL;
561 break;
562 } else if (error)
563 break;
564 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp);
565 } else {
566 blsize = pmp->pm_bpcluster;
567 rablock = lbn + 1;
568 if (seqcount > 1 &&
569 de_cn2off(pmp, rablock) < dep->de_FileSize) {
570 rasize = pmp->pm_bpcluster;
571 error = breadn(vp, lbn, blsize,
572 &rablock, &rasize, 1, NOCRED, &bp);
573 } else {
574 error = bread(vp, lbn, blsize, NOCRED, &bp);
575 }
576 }
577 if (error) {
578 brelse(bp);
579 break;
580 }
581 on = uio->uio_offset & pmp->pm_crbomask;
582 diff = pmp->pm_bpcluster - on;
583 n = diff > uio->uio_resid ? uio->uio_resid : diff;
584 diff = dep->de_FileSize - uio->uio_offset;
585 if (diff < n)
586 n = diff;
587 diff = blsize - bp->b_resid;
588 if (diff < n)
589 n = diff;
590 error = uiomove(bp->b_data + on, (int) n, uio);
591 brelse(bp);
592 } while (error == 0 && uio->uio_resid > 0 && n != 0);
593 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) &&
594 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
595 dep->de_flag |= DE_ACCESS;
596 return (error);
597}
598
599/*
600 * Write data to a file or directory.
601 */
602static int
603msdosfs_write(ap)
604 struct vop_write_args /* {
605 struct vnode *a_vp;
606 struct uio *a_uio;
607 int a_ioflag;
608 struct ucred *a_cred;
609 } */ *ap;
610{
611 int n;
612 int croffset;
613 int resid;
614 u_long osize;
615 int error = 0;
616 u_long count;
617 daddr_t bn, lastcn;
618 struct buf *bp;
619 int ioflag = ap->a_ioflag;
620 struct uio *uio = ap->a_uio;
621 struct thread *td = uio->uio_td;
622 struct vnode *vp = ap->a_vp;
623 struct vnode *thisvp;
624 struct denode *dep = VTODE(vp);
625 struct msdosfsmount *pmp = dep->de_pmp;
626 struct ucred *cred = ap->a_cred;
627
628#ifdef MSDOSFS_DEBUG
629 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
630 vp, uio, ioflag, cred);
631 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
632 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
633#endif
634
635 switch (vp->v_type) {
636 case VREG:
637 if (ioflag & IO_APPEND)
638 uio->uio_offset = dep->de_FileSize;
639 thisvp = vp;
640 break;
641 case VDIR:
642 return EISDIR;
643 default:
644 panic("msdosfs_write(): bad file type");
645 }
646
647 if (uio->uio_offset < 0)
648 return (EFBIG);
649
650 if (uio->uio_resid == 0)
651 return (0);
652
653 /*
654 * If they've exceeded their filesize limit, tell them about it.
655 */
656 if (td != NULL) {
657 PROC_LOCK(td->td_proc);
658 if ((uoff_t)uio->uio_offset + uio->uio_resid >
659 lim_cur(td->td_proc, RLIMIT_FSIZE)) {
660 psignal(td->td_proc, SIGXFSZ);
661 PROC_UNLOCK(td->td_proc);
662 return (EFBIG);
663 }
664 PROC_UNLOCK(td->td_proc);
665 }
666
667 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX)
668 return (EFBIG);
669
670 /*
671 * If the offset we are starting the write at is beyond the end of
672 * the file, then they've done a seek. Unix filesystems allow
673 * files with holes in them, DOS doesn't so we must fill the hole
674 * with zeroed blocks.
675 */
676 if (uio->uio_offset > dep->de_FileSize) {
677 error = deextend(dep, uio->uio_offset, cred);
678 if (error)
679 return (error);
680 }
681
682 /*
683 * Remember some values in case the write fails.
684 */
685 resid = uio->uio_resid;
686 osize = dep->de_FileSize;
687
688 /*
689 * If we write beyond the end of the file, extend it to its ultimate
690 * size ahead of the time to hopefully get a contiguous area.
691 */
692 if (uio->uio_offset + resid > osize) {
693 count = de_clcount(pmp, uio->uio_offset + resid) -
694 de_clcount(pmp, osize);
695 error = extendfile(dep, count, NULL, NULL, 0);
696 if (error && (error != ENOSPC || (ioflag & IO_UNIT)))
697 goto errexit;
698 lastcn = dep->de_fc[FC_LASTFC].fc_frcn;
699 } else
700 lastcn = de_clcount(pmp, osize) - 1;
701
702 do {
703 if (de_cluster(pmp, uio->uio_offset) > lastcn) {
704 error = ENOSPC;
705 break;
706 }
707
708 croffset = uio->uio_offset & pmp->pm_crbomask;
709 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset);
710 if (uio->uio_offset + n > dep->de_FileSize) {
711 dep->de_FileSize = uio->uio_offset + n;
712 /* The object size needs to be set before buffer is allocated */
713 vnode_pager_setsize(vp, dep->de_FileSize);
714 }
715
716 bn = de_cluster(pmp, uio->uio_offset);
717 if ((uio->uio_offset & pmp->pm_crbomask) == 0
718 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid)
719 > de_cluster(pmp, uio->uio_offset)
720 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) {
721 /*
722 * If either the whole cluster gets written,
723 * or we write the cluster from its start beyond EOF,
724 * then no need to read data from disk.
725 */
726 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0);
727 clrbuf(bp);
728 /*
729 * Do the bmap now, since pcbmap needs buffers
730 * for the fat table. (see msdosfs_strategy)
731 */
732 if (bp->b_blkno == bp->b_lblkno) {
733 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0);
734 if (error)
735 bp->b_blkno = -1;
736 else
737 bp->b_blkno = bn;
738 }
739 if (bp->b_blkno == -1) {
740 brelse(bp);
741 if (!error)
742 error = EIO; /* XXX */
743 break;
744 }
745 } else {
746 /*
747 * The block we need to write into exists, so read it in.
748 */
749 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp);
750 if (error) {
751 brelse(bp);
752 break;
753 }
754 }
755
756 /*
757 * Should these vnode_pager_* functions be done on dir
758 * files?
759 */
760
761 /*
762 * Copy the data from user space into the buf header.
763 */
764 error = uiomove(bp->b_data + croffset, n, uio);
765 if (error) {
766 brelse(bp);
767 break;
768 }
769
770 /*
771 * If they want this synchronous then write it and wait for
772 * it. Otherwise, if on a cluster boundary write it
773 * asynchronously so we can move on to the next block
774 * without delay. Otherwise do a delayed write because we
775 * may want to write somemore into the block later.
776 */
777 if (ioflag & IO_SYNC)
778 (void) bwrite(bp);
779 else if (n + croffset == pmp->pm_bpcluster)
780 bawrite(bp);
781 else
782 bdwrite(bp);
783 dep->de_flag |= DE_UPDATE;
784 } while (error == 0 && uio->uio_resid > 0);
785
786 /*
787 * If the write failed and they want us to, truncate the file back
788 * to the size it was before the write was attempted.
789 */
790errexit:
791 if (error) {
792 if (ioflag & IO_UNIT) {
793 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL);
794 uio->uio_offset -= resid - uio->uio_resid;
795 uio->uio_resid = resid;
796 } else {
797 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL);
798 if (uio->uio_resid != resid)
799 error = 0;
800 }
801 } else if (ioflag & IO_SYNC)
802 error = deupdat(dep, 1);
803 return (error);
804}
805
806/*
807 * Flush the blocks of a file to disk.
808 *
809 * This function is worthless for vnodes that represent directories. Maybe we
810 * could just do a sync if they try an fsync on a directory file.
811 */
812static int
813msdosfs_fsync(ap)
814 struct vop_fsync_args /* {
815 struct vnode *a_vp;
816 struct ucred *a_cred;
817 int a_waitfor;
818 struct thread *a_td;
819 } */ *ap;
820{
821 /*
822 * Flush our dirty buffers.
823 */
824 vop_stdfsync(ap);
825
826 return (deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT));
827}
828
829static int
830msdosfs_remove(ap)
831 struct vop_remove_args /* {
832 struct vnode *a_dvp;
833 struct vnode *a_vp;
834 struct componentname *a_cnp;
835 } */ *ap;
836{
837 struct denode *dep = VTODE(ap->a_vp);
838 struct denode *ddep = VTODE(ap->a_dvp);
839 int error;
840
841 if (ap->a_vp->v_type == VDIR)
842 error = EPERM;
843 else
844 error = removede(ddep, dep);
845#ifdef MSDOSFS_DEBUG
846 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount);
847#endif
848 return (error);
849}
850
851/*
852 * DOS filesystems don't know what links are.
853 */
854static int
855msdosfs_link(ap)
856 struct vop_link_args /* {
857 struct vnode *a_tdvp;
858 struct vnode *a_vp;
859 struct componentname *a_cnp;
860 } */ *ap;
861{
862 return (EOPNOTSUPP);
863}
864
865/*
866 * Renames on files require moving the denode to a new hash queue since the
867 * denode's location is used to compute which hash queue to put the file
868 * in. Unless it is a rename in place. For example "mv a b".
869 *
870 * What follows is the basic algorithm:
871 *
872 * if (file move) {
873 * if (dest file exists) {
874 * remove dest file
875 * }
876 * if (dest and src in same directory) {
877 * rewrite name in existing directory slot
878 * } else {
879 * write new entry in dest directory
880 * update offset and dirclust in denode
881 * move denode to new hash chain
882 * clear old directory entry
883 * }
884 * } else {
885 * directory move
886 * if (dest directory exists) {
887 * if (dest is not empty) {
888 * return ENOTEMPTY
889 * }
890 * remove dest directory
891 * }
892 * if (dest and src in same directory) {
893 * rewrite name in existing entry
894 * } else {
895 * be sure dest is not a child of src directory
896 * write entry in dest directory
897 * update "." and ".." in moved directory
898 * clear old directory entry for moved directory
899 * }
900 * }
901 *
902 * On entry:
903 * source's parent directory is unlocked
904 * source file or directory is unlocked
905 * destination's parent directory is locked
906 * destination file or directory is locked if it exists
907 *
908 * On exit:
909 * all denodes should be released
910 */
911static int
912msdosfs_rename(ap)
913 struct vop_rename_args /* {
914 struct vnode *a_fdvp;
915 struct vnode *a_fvp;
916 struct componentname *a_fcnp;
917 struct vnode *a_tdvp;
918 struct vnode *a_tvp;
919 struct componentname *a_tcnp;
920 } */ *ap;
921{
922 struct vnode *tdvp = ap->a_tdvp;
923 struct vnode *fvp = ap->a_fvp;
924 struct vnode *fdvp = ap->a_fdvp;
925 struct vnode *tvp = ap->a_tvp;
926 struct componentname *tcnp = ap->a_tcnp;
927 struct componentname *fcnp = ap->a_fcnp;
928 struct thread *td = fcnp->cn_thread;
929 struct denode *ip, *xp, *dp, *zp;
930 u_char toname[11], oldname[11];
931 u_long from_diroffset, to_diroffset;
932 u_char to_count;
933 int doingdirectory = 0, newparent = 0;
934 int error;
935 u_long cn;
936 daddr_t bn;
937 struct denode *fddep; /* from file's parent directory */
938 struct msdosfsmount *pmp;
939 struct direntry *dotdotp;
940 struct buf *bp;
941
942 fddep = VTODE(ap->a_fdvp);
943 pmp = fddep->de_pmp;
944
945 pmp = VFSTOMSDOSFS(fdvp->v_mount);
946
947#ifdef DIAGNOSTIC
948 if ((tcnp->cn_flags & HASBUF) == 0 ||
949 (fcnp->cn_flags & HASBUF) == 0)
950 panic("msdosfs_rename: no name");
951#endif
952 /*
953 * Check for cross-device rename.
954 */
955 if ((fvp->v_mount != tdvp->v_mount) ||
956 (tvp && (fvp->v_mount != tvp->v_mount))) {
957 error = EXDEV;
958abortit:
959 if (tdvp == tvp)
960 vrele(tdvp);
961 else
962 vput(tdvp);
963 if (tvp)
964 vput(tvp);
965 vrele(fdvp);
966 vrele(fvp);
967 return (error);
968 }
969
970 /*
971 * If source and dest are the same, do nothing.
972 */
973 if (tvp == fvp) {
974 error = 0;
975 goto abortit;
976 }
977
978 error = vn_lock(fvp, LK_EXCLUSIVE, td);
979 if (error)
980 goto abortit;
981 dp = VTODE(fdvp);
982 ip = VTODE(fvp);
983
984 /*
985 * Be sure we are not renaming ".", "..", or an alias of ".". This
986 * leads to a crippled directory tree. It's pretty tough to do a
987 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
988 * doesn't work if the ".." entry is missing.
989 */
990 if (ip->de_Attributes & ATTR_DIRECTORY) {
991 /*
992 * Avoid ".", "..", and aliases of "." for obvious reasons.
993 */
994 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
995 dp == ip ||
996 (fcnp->cn_flags & ISDOTDOT) ||
997 (tcnp->cn_flags & ISDOTDOT) ||
998 (ip->de_flag & DE_RENAME)) {
999 VOP_UNLOCK(fvp, 0, td);
1000 error = EINVAL;
1001 goto abortit;
1002 }
1003 ip->de_flag |= DE_RENAME;
1004 doingdirectory++;
1005 }
1006
1007 /*
1008 * When the target exists, both the directory
1009 * and target vnodes are returned locked.
1010 */
1011 dp = VTODE(tdvp);
1012 xp = tvp ? VTODE(tvp) : NULL;
1013 /*
1014 * Remember direntry place to use for destination
1015 */
1016 to_diroffset = dp->de_fndoffset;
1017 to_count = dp->de_fndcnt;
1018
1019 /*
1020 * If ".." must be changed (ie the directory gets a new
1021 * parent) then the source directory must not be in the
1022 * directory heirarchy above the target, as this would
1023 * orphan everything below the source directory. Also
1024 * the user must have write permission in the source so
1025 * as to be able to change "..". We must repeat the call
1026 * to namei, as the parent directory is unlocked by the
1027 * call to doscheckpath().
1028 */
1029 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
1030 VOP_UNLOCK(fvp, 0, td);
1031 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
1032 newparent = 1;
1033 if (doingdirectory && newparent) {
1034 if (error) /* write access check above */
1035 goto bad;
1036 if (xp != NULL)
1037 vput(tvp);
1038 /*
1039 * doscheckpath() vput()'s dp,
1040 * so we have to do a relookup afterwards
1041 */
1042 error = doscheckpath(ip, dp);
1043 if (error)
1044 goto out;
1045 if ((tcnp->cn_flags & SAVESTART) == 0)
1046 panic("msdosfs_rename: lost to startdir");
1047 error = relookup(tdvp, &tvp, tcnp);
1048 if (error)
1049 goto out;
1050 dp = VTODE(tdvp);
1051 xp = tvp ? VTODE(tvp) : NULL;
1052 }
1053
1054 if (xp != NULL) {
1055 /*
1056 * Target must be empty if a directory and have no links
1057 * to it. Also, ensure source and target are compatible
1058 * (both directories, or both not directories).
1059 */
1060 if (xp->de_Attributes & ATTR_DIRECTORY) {
1061 if (!dosdirempty(xp)) {
1062 error = ENOTEMPTY;
1063 goto bad;
1064 }
1065 if (!doingdirectory) {
1066 error = ENOTDIR;
1067 goto bad;
1068 }
1069 cache_purge(tdvp);
1070 } else if (doingdirectory) {
1071 error = EISDIR;
1072 goto bad;
1073 }
1074 error = removede(dp, xp);
1075 if (error)
1076 goto bad;
1077 vput(tvp);
1078 xp = NULL;
1079 }
1080
1081 /*
1082 * Convert the filename in tcnp into a dos filename. We copy this
1083 * into the denode and directory entry for the destination
1084 * file/directory.
1085 */
1086 error = uniqdosname(VTODE(tdvp), tcnp, toname);
1087 if (error)
1088 goto abortit;
1089
1090 /*
1091 * Since from wasn't locked at various places above,
1092 * have to do a relookup here.
1093 */
1094 fcnp->cn_flags &= ~MODMASK;
1095 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1096 if ((fcnp->cn_flags & SAVESTART) == 0)
1097 panic("msdosfs_rename: lost from startdir");
1098 if (!newparent)
1099 VOP_UNLOCK(tdvp, 0, td);
1100 if (relookup(fdvp, &fvp, fcnp) == 0)
1101 vrele(fdvp);
1102 if (fvp == NULL) {
1103 /*
1104 * From name has disappeared.
1105 */
1106 if (doingdirectory)
1107 panic("rename: lost dir entry");
1108 vrele(ap->a_fvp);
1109 if (newparent)
1110 VOP_UNLOCK(tdvp, 0, td);
1111 vrele(tdvp);
1112 return 0;
1113 }
1114 xp = VTODE(fvp);
1115 zp = VTODE(fdvp);
1116 from_diroffset = zp->de_fndoffset;
1117
1118 /*
1119 * Ensure that the directory entry still exists and has not
1120 * changed till now. If the source is a file the entry may
1121 * have been unlinked or renamed. In either case there is
1122 * no further work to be done. If the source is a directory
1123 * then it cannot have been rmdir'ed or renamed; this is
1124 * prohibited by the DE_RENAME flag.
1125 */
1126 if (xp != ip) {
1127 if (doingdirectory)
1128 panic("rename: lost dir entry");
1129 vrele(ap->a_fvp);
1130 VOP_UNLOCK(fvp, 0, td);
1131 if (newparent)
1132 VOP_UNLOCK(fdvp, 0, td);
1133 xp = NULL;
1134 } else {
1135 vrele(fvp);
1136 xp = NULL;
1137
1138 /*
1139 * First write a new entry in the destination
1140 * directory and mark the entry in the source directory
1141 * as deleted. Then move the denode to the correct hash
1142 * chain for its new location in the filesystem. And, if
1143 * we moved a directory, then update its .. entry to point
1144 * to the new parent directory.
1145 */
1146 bcopy(ip->de_Name, oldname, 11);
1147 bcopy(toname, ip->de_Name, 11); /* update denode */
1148 dp->de_fndoffset = to_diroffset;
1149 dp->de_fndcnt = to_count;
1150 error = createde(ip, dp, (struct denode **)0, tcnp);
1151 if (error) {
1152 bcopy(oldname, ip->de_Name, 11);
1153 if (newparent)
1154 VOP_UNLOCK(fdvp, 0, td);
1155 VOP_UNLOCK(fvp, 0, td);
1156 goto bad;
1157 }
1158 ip->de_refcnt++;
1159 zp->de_fndoffset = from_diroffset;
1160 error = removede(zp, ip);
1161 if (error) {
1162 /* XXX should really panic here, fs is corrupt */
1163 if (newparent)
1164 VOP_UNLOCK(fdvp, 0, td);
1165 VOP_UNLOCK(fvp, 0, td);
1166 goto bad;
1167 }
1168 if (!doingdirectory) {
1169 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0,
1170 &ip->de_dirclust, 0);
1171 if (error) {
1172 /* XXX should really panic here, fs is corrupt */
1173 if (newparent)
1174 VOP_UNLOCK(fdvp, 0, td);
1175 VOP_UNLOCK(fvp, 0, td);
1176 goto bad;
1177 }
1178 if (ip->de_dirclust == MSDOSFSROOT)
1179 ip->de_diroffset = to_diroffset;
1180 else
1181 ip->de_diroffset = to_diroffset & pmp->pm_crbomask;
1182 }
1183 reinsert(ip);
1184 if (newparent)
1185 VOP_UNLOCK(fdvp, 0, td);
1186 }
1187
1188 /*
1189 * If we moved a directory to a new parent directory, then we must
1190 * fixup the ".." entry in the moved directory.
1191 */
1192 if (doingdirectory && newparent) {
1193 cn = ip->de_StartCluster;
1194 if (cn == MSDOSFSROOT) {
1195 /* this should never happen */
1196 panic("msdosfs_rename(): updating .. in root directory?");
1197 } else
1198 bn = cntobn(pmp, cn);
1199 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
1200 NOCRED, &bp);
1201 if (error) {
1202 /* XXX should really panic here, fs is corrupt */
1203 brelse(bp);
1204 VOP_UNLOCK(fvp, 0, td);
1205 goto bad;
1206 }
1207 dotdotp = (struct direntry *)bp->b_data + 1;
1208 putushort(dotdotp->deStartCluster, dp->de_StartCluster);
1209 if (FAT32(pmp))
1210 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16);
1211 error = bwrite(bp);
1212 if (error) {
1213 /* XXX should really panic here, fs is corrupt */
1214 VOP_UNLOCK(fvp, 0, td);
1215 goto bad;
1216 }
1217 }
1218
1219 VOP_UNLOCK(fvp, 0, td);
1220bad:
1221 if (xp)
1222 vput(tvp);
1223 vput(tdvp);
1224out:
1225 ip->de_flag &= ~DE_RENAME;
1226 vrele(fdvp);
1227 vrele(fvp);
1228 return (error);
1229
1230}
1231
1232static struct {
1233 struct direntry dot;
1234 struct direntry dotdot;
1235} dosdirtemplate = {
1236 { ". ", " ", /* the . entry */
1237 ATTR_DIRECTORY, /* file attribute */
1238 0, /* reserved */
1239 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1240 { 0, 0 }, /* access date */
1241 { 0, 0 }, /* high bits of start cluster */
1242 { 210, 4 }, { 210, 4 }, /* modify time & date */
1243 { 0, 0 }, /* startcluster */
1244 { 0, 0, 0, 0 } /* filesize */
1245 },
1246 { ".. ", " ", /* the .. entry */
1247 ATTR_DIRECTORY, /* file attribute */
1248 0, /* reserved */
1249 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1250 { 0, 0 }, /* access date */
1251 { 0, 0 }, /* high bits of start cluster */
1252 { 210, 4 }, { 210, 4 }, /* modify time & date */
1253 { 0, 0 }, /* startcluster */
1254 { 0, 0, 0, 0 } /* filesize */
1255 }
1256};
1257
1258static int
1259msdosfs_mkdir(ap)
1260 struct vop_mkdir_args /* {
1261 struct vnode *a_dvp;
1262 struvt vnode **a_vpp;
1263 struvt componentname *a_cnp;
1264 struct vattr *a_vap;
1265 } */ *ap;
1266{
1267 struct componentname *cnp = ap->a_cnp;
1268 struct denode *dep;
1269 struct denode *pdep = VTODE(ap->a_dvp);
1270 struct direntry *denp;
1271 struct msdosfsmount *pmp = pdep->de_pmp;
1272 struct buf *bp;
1273 u_long newcluster, pcl;
1274 int bn;
1275 int error;
1276 struct denode ndirent;
1277 struct timespec ts;
1278
1279 /*
1280 * If this is the root directory and there is no space left we
1281 * can't do anything. This is because the root directory can not
1282 * change size.
1283 */
1284 if (pdep->de_StartCluster == MSDOSFSROOT
1285 && pdep->de_fndoffset >= pdep->de_FileSize) {
1286 error = ENOSPC;
1287 goto bad2;
1288 }
1289
1290 /*
1291 * Allocate a cluster to hold the about to be created directory.
1292 */
1293 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL);
1294 if (error)
1295 goto bad2;
1296
1297 bzero(&ndirent, sizeof(ndirent));
1298 ndirent.de_pmp = pmp;
1299 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1300 getnanotime(&ts);
1301 DETIMES(&ndirent, &ts, &ts, &ts);
1302
1303 /*
1304 * Now fill the cluster with the "." and ".." entries. And write
1305 * the cluster to disk. This way it is there for the parent
1306 * directory to be pointing at if there were a crash.
1307 */
1308 bn = cntobn(pmp, newcluster);
1309 /* always succeeds */
1310 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0);
1311 bzero(bp->b_data, pmp->pm_bpcluster);
1312 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate);
1313 denp = (struct direntry *)bp->b_data;
1314 putushort(denp[0].deStartCluster, newcluster);
1315 putushort(denp[0].deCDate, ndirent.de_CDate);
1316 putushort(denp[0].deCTime, ndirent.de_CTime);
1317 denp[0].deCHundredth = ndirent.de_CHun;
1318 putushort(denp[0].deADate, ndirent.de_ADate);
1319 putushort(denp[0].deMDate, ndirent.de_MDate);
1320 putushort(denp[0].deMTime, ndirent.de_MTime);
1321 pcl = pdep->de_StartCluster;
1322 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1323 pcl = 0;
1324 putushort(denp[1].deStartCluster, pcl);
1325 putushort(denp[1].deCDate, ndirent.de_CDate);
1326 putushort(denp[1].deCTime, ndirent.de_CTime);
1327 denp[1].deCHundredth = ndirent.de_CHun;
1328 putushort(denp[1].deADate, ndirent.de_ADate);
1329 putushort(denp[1].deMDate, ndirent.de_MDate);
1330 putushort(denp[1].deMTime, ndirent.de_MTime);
1331 if (FAT32(pmp)) {
1332 putushort(denp[0].deHighClust, newcluster >> 16);
1333 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16);
1334 }
1335
1336 error = bwrite(bp);
1337 if (error)
1338 goto bad;
1339
1340 /*
1341 * Now build up a directory entry pointing to the newly allocated
1342 * cluster. This will be written to an empty slot in the parent
1343 * directory.
1344 */
1345#ifdef DIAGNOSTIC
1346 if ((cnp->cn_flags & HASBUF) == 0)
1347 panic("msdosfs_mkdir: no name");
1348#endif
1349 error = uniqdosname(pdep, cnp, ndirent.de_Name);
1350 if (error)
1351 goto bad;
1352
1353 ndirent.de_Attributes = ATTR_DIRECTORY;
1354 ndirent.de_LowerCase = 0;
1355 ndirent.de_StartCluster = newcluster;
1356 ndirent.de_FileSize = 0;
1357 ndirent.de_dev = pdep->de_dev;
1358 error = createde(&ndirent, pdep, &dep, cnp);
1359 if (error)
1360 goto bad;
1361 *ap->a_vpp = DETOV(dep);
1362 return (0);
1363
1364bad:
1365 clusterfree(pmp, newcluster, NULL);
1366bad2:
1367 return (error);
1368}
1369
1370static int
1371msdosfs_rmdir(ap)
1372 struct vop_rmdir_args /* {
1373 struct vnode *a_dvp;
1374 struct vnode *a_vp;
1375 struct componentname *a_cnp;
1376 } */ *ap;
1377{
1378 struct vnode *vp = ap->a_vp;
1379 struct vnode *dvp = ap->a_dvp;
1380 struct componentname *cnp = ap->a_cnp;
1381 struct denode *ip, *dp;
1382 struct thread *td = cnp->cn_thread;
1383 int error;
1384
1385 ip = VTODE(vp);
1386 dp = VTODE(dvp);
1387
1388 /*
1389 * Verify the directory is empty (and valid).
1390 * (Rmdir ".." won't be valid since
1391 * ".." will contain a reference to
1392 * the current directory and thus be
1393 * non-empty.)
1394 */
1395 error = 0;
1396 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) {
1397 error = ENOTEMPTY;
1398 goto out;
1399 }
1400 /*
1401 * Delete the entry from the directory. For dos filesystems this
1402 * gets rid of the directory entry on disk, the in memory copy
1403 * still exists but the de_refcnt is <= 0. This prevents it from
1404 * being found by deget(). When the vput() on dep is done we give
1405 * up access and eventually msdosfs_reclaim() will be called which
1406 * will remove it from the denode cache.
1407 */
1408 error = removede(dp, ip);
1409 if (error)
1410 goto out;
1411 /*
1412 * This is where we decrement the link count in the parent
1413 * directory. Since dos filesystems don't do this we just purge
1414 * the name cache.
1415 */
1416 cache_purge(dvp);
1417 VOP_UNLOCK(dvp, 0, td);
1418 /*
1419 * Truncate the directory that is being deleted.
1420 */
1421 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, td);
1422 cache_purge(vp);
1423
1424 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
1425out:
1426 return (error);
1427}
1428
1429/*
1430 * DOS filesystems don't know what symlinks are.
1431 */
1432static int
1433msdosfs_symlink(ap)
1434 struct vop_symlink_args /* {
1435 struct vnode *a_dvp;
1436 struct vnode **a_vpp;
1437 struct componentname *a_cnp;
1438 struct vattr *a_vap;
1439 char *a_target;
1440 } */ *ap;
1441{
1442 return (EOPNOTSUPP);
1443}
1444
1445static int
1446msdosfs_readdir(ap)
1447 struct vop_readdir_args /* {
1448 struct vnode *a_vp;
1449 struct uio *a_uio;
1450 struct ucred *a_cred;
1451 int *a_eofflag;
1452 int *a_ncookies;
1453 u_long **a_cookies;
1454 } */ *ap;
1455{
1456 int error = 0;
1457 int diff;
1458 long n;
1459 int blsize;
1460 long on;
1461 u_long cn;
1462 uint64_t fileno;
1463 u_long dirsperblk;
1464 long bias = 0;
1465 daddr_t bn, lbn;
1466 struct buf *bp;
1467 struct denode *dep = VTODE(ap->a_vp);
1468 struct msdosfsmount *pmp = dep->de_pmp;
1469 struct direntry *dentp;
1470 struct dirent dirbuf;
1471 struct uio *uio = ap->a_uio;
1472 u_long *cookies = NULL;
1473 int ncookies = 0;
1474 off_t offset, off;
1475 int chksum = -1;
1476
1477#ifdef MSDOSFS_DEBUG
1478 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
1479 ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
1480#endif
1481
1482 /*
1483 * msdosfs_readdir() won't operate properly on regular files since
1484 * it does i/o only with the the filesystem vnode, and hence can
1485 * retrieve the wrong block from the buffer cache for a plain file.
1486 * So, fail attempts to readdir() on a plain file.
1487 */
1488 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
1489 return (ENOTDIR);
1490
1491 /*
1492 * To be safe, initialize dirbuf
1493 */
1494 bzero(dirbuf.d_name, sizeof(dirbuf.d_name));
1495
1496 /*
1497 * If the user buffer is smaller than the size of one dos directory
1498 * entry or the file offset is not a multiple of the size of a
1499 * directory entry, then we fail the read.
1500 */
1501 off = offset = uio->uio_offset;
1502 if (uio->uio_resid < sizeof(struct direntry) ||
1503 (offset & (sizeof(struct direntry) - 1)))
1504 return (EINVAL);
1505
1506 if (ap->a_ncookies) {
1507 ncookies = uio->uio_resid / 16;
1508 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP,
1509 M_WAITOK);
1510 *ap->a_cookies = cookies;
1511 *ap->a_ncookies = ncookies;
1512 }
1513
1514 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1515
1516 /*
1517 * If they are reading from the root directory then, we simulate
1518 * the . and .. entries since these don't exist in the root
1519 * directory. We also set the offset bias to make up for having to
1520 * simulate these entries. By this I mean that at file offset 64 we
1521 * read the first entry in the root directory that lives on disk.
1522 */
1523 if (dep->de_StartCluster == MSDOSFSROOT
1524 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
1525#if 0
1526 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n",
1527 offset);
1528#endif
1529 bias = 2 * sizeof(struct direntry);
1530 if (offset < bias) {
1531 for (n = (int)offset / sizeof(struct direntry);
1532 n < 2; n++) {
1533 if (FAT32(pmp))
1534 fileno = (uint64_t)cntobn(pmp,
1535 pmp->pm_rootdirblk)
1536 * dirsperblk;
1537 else
1538 fileno = 1;
1539#ifdef MSDOSFS_LARGE
1540 dirbuf.d_fileno = msdosfs_fileno_map(
1541 pmp->pm_mountp, fileno);
1542#else
1543 dirbuf.d_fileno = (uint32_t)fileno;
1544#endif
1545 dirbuf.d_type = DT_DIR;
1546 switch (n) {
1547 case 0:
1548 dirbuf.d_namlen = 1;
1549 strcpy(dirbuf.d_name, ".");
1550 break;
1551 case 1:
1552 dirbuf.d_namlen = 2;
1553 strcpy(dirbuf.d_name, "..");
1554 break;
1555 }
1556 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1557 if (uio->uio_resid < dirbuf.d_reclen)
1558 goto out;
1559 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1560 if (error)
1561 goto out;
1562 offset += sizeof(struct direntry);
1563 off = offset;
1564 if (cookies) {
1565 *cookies++ = offset;
1566 if (--ncookies <= 0)
1567 goto out;
1568 }
1569 }
1570 }
1571 }
1572
1573 mbnambuf_init();
1574 off = offset;
1575 while (uio->uio_resid > 0) {
1576 lbn = de_cluster(pmp, offset - bias);
1577 on = (offset - bias) & pmp->pm_crbomask;
1578 n = min(pmp->pm_bpcluster - on, uio->uio_resid);
1579 diff = dep->de_FileSize - (offset - bias);
1580 if (diff <= 0)
1581 break;
1582 n = min(n, diff);
1583 error = pcbmap(dep, lbn, &bn, &cn, &blsize);
1584 if (error)
1585 break;
1586 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp);
1587 if (error) {
1588 brelse(bp);
1589 return (error);
1590 }
1591 n = min(n, blsize - bp->b_resid);
1592 if (n == 0) {
1593 brelse(bp);
1594 return (EIO);
1595 }
1596
1597 /*
1598 * Convert from dos directory entries to fs-independent
1599 * directory entries.
1600 */
1601 for (dentp = (struct direntry *)(bp->b_data + on);
1602 (char *)dentp < bp->b_data + on + n;
1603 dentp++, offset += sizeof(struct direntry)) {
1604#if 0
1605 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
1606 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
1607#endif
1608 /*
1609 * If this is an unused entry, we can stop.
1610 */
1611 if (dentp->deName[0] == SLOT_EMPTY) {
1612 brelse(bp);
1613 goto out;
1614 }
1615 /*
1616 * Skip deleted entries.
1617 */
1618 if (dentp->deName[0] == SLOT_DELETED) {
1619 chksum = -1;
1620 mbnambuf_init();
1621 continue;
1622 }
1623
1624 /*
1625 * Handle Win95 long directory entries
1626 */
1627 if (dentp->deAttributes == ATTR_WIN95) {
1628 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
1629 continue;
1630 chksum = win2unixfn((struct winentry *)dentp,
1631 chksum, pmp);
1632 continue;
1633 }
1634
1635 /*
1636 * Skip volume labels
1637 */
1638 if (dentp->deAttributes & ATTR_VOLUME) {
1639 chksum = -1;
1640 mbnambuf_init();
1641 continue;
1642 }
1643 /*
1644 * This computation of d_fileno must match
1645 * the computation of va_fileid in
1646 * msdosfs_getattr.
1647 */
1648 if (dentp->deAttributes & ATTR_DIRECTORY) {
1649 fileno = getushort(dentp->deStartCluster);
1650 if (FAT32(pmp))
1651 fileno |= getushort(dentp->deHighClust) << 16;
1652 /* if this is the root directory */
1653 if (fileno == MSDOSFSROOT)
1654 if (FAT32(pmp))
1655 fileno = (uint64_t)cntobn(pmp,
1656 pmp->pm_rootdirblk)
1657 * dirsperblk;
1658 else
1659 fileno = 1;
1660 else
1661 fileno = (uint64_t)cntobn(pmp, fileno) *
1662 dirsperblk;
1663 dirbuf.d_type = DT_DIR;
1664 } else {
1665 fileno = (uint64_t)offset / sizeof(struct direntry);
1666 dirbuf.d_type = DT_REG;
1667 }
1668#ifdef MSDOSFS_LARGE
1669 dirbuf.d_fileno = msdosfs_fileno_map(pmp->pm_mountp,
1670 fileno);
1671#else
1672 dirbuf.d_fileno = (uint32_t)fileno;
1673#endif
1674 if (chksum != winChksum(dentp->deName)) {
1675 dirbuf.d_namlen = dos2unixfn(dentp->deName,
1676 (u_char *)dirbuf.d_name,
1677 dentp->deLowerCase |
1678 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ?
1679 (LCASE_BASE | LCASE_EXT) : 0),
1680 pmp);
1681 mbnambuf_init();
1682 } else
1683 mbnambuf_flush(&dirbuf);
1684 chksum = -1;
1685 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1686 if (uio->uio_resid < dirbuf.d_reclen) {
1687 brelse(bp);
1688 goto out;
1689 }
1690 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1691 if (error) {
1692 brelse(bp);
1693 goto out;
1694 }
1695 if (cookies) {
1696 *cookies++ = offset + sizeof(struct direntry);
1697 if (--ncookies <= 0) {
1698 brelse(bp);
1699 goto out;
1700 }
1701 }
1702 off = offset + sizeof(struct direntry);
1703 }
1704 brelse(bp);
1705 }
1706out:
1707 /* Subtract unused cookies */
1708 if (ap->a_ncookies)
1709 *ap->a_ncookies -= ncookies;
1710
1711 uio->uio_offset = off;
1712
1713 /*
1714 * Set the eofflag (NFS uses it)
1715 */
1716 if (ap->a_eofflag) {
1717 if (dep->de_FileSize - (offset - bias) <= 0)
1718 *ap->a_eofflag = 1;
1719 else
1720 *ap->a_eofflag = 0;
1721 }
1722 return (error);
1723}
1724
1725/*
1726 * vp - address of vnode file the file
1727 * bn - which cluster we are interested in mapping to a filesystem block number.
1728 * vpp - returns the vnode for the block special file holding the filesystem
1729 * containing the file of interest
1730 * bnp - address of where to return the filesystem relative block number
1731 */
1732static int
1733msdosfs_bmap(ap)
1734 struct vop_bmap_args /* {
1735 struct vnode *a_vp;
1736 daddr_t a_bn;
1737 struct bufobj **a_bop;
1738 daddr_t *a_bnp;
1739 int *a_runp;
1740 int *a_runb;
1741 } */ *ap;
1742{
1743 struct denode *dep = VTODE(ap->a_vp);
1744 daddr_t blkno;
1745 int error;
1746
1747 if (ap->a_bop != NULL)
1748 *ap->a_bop = &dep->de_pmp->pm_devvp->v_bufobj;
1749 if (ap->a_bnp == NULL)
1750 return (0);
1751 if (ap->a_runp) {
1752 /*
1753 * Sequential clusters should be counted here.
1754 */
1755 *ap->a_runp = 0;
1756 }
1757 if (ap->a_runb) {
1758 *ap->a_runb = 0;
1759 }
1760 error = pcbmap(dep, ap->a_bn, &blkno, 0, 0);
1761 *ap->a_bnp = blkno;
1762 return (error);
1763}
1764
1765static int
1766msdosfs_strategy(ap)
1767 struct vop_strategy_args /* {
1768 struct vnode *a_vp;
1769 struct buf *a_bp;
1770 } */ *ap;
1771{
1772 struct buf *bp = ap->a_bp;
1773 struct denode *dep = VTODE(ap->a_vp);
1774 struct bufobj *bo;
1775 int error = 0;
1776 daddr_t blkno;
1777
1778 /*
1779 * If we don't already know the filesystem relative block number
1780 * then get it using pcbmap(). If pcbmap() returns the block
1781 * number as -1 then we've got a hole in the file. DOS filesystems
1782 * don't allow files with holes, so we shouldn't ever see this.
1783 */
1784 if (bp->b_blkno == bp->b_lblkno) {
1785 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0);
1786 bp->b_blkno = blkno;
1787 if (error) {
1788 bp->b_error = error;
1789 bp->b_ioflags |= BIO_ERROR;
1790 bufdone(bp);
1791 return (error);
1792 }
1793 if ((long)bp->b_blkno == -1)
1794 vfs_bio_clrbuf(bp);
1795 }
1796 if (bp->b_blkno == -1) {
1797 bufdone(bp);
1798 return (0);
1799 }
1800 /*
1801 * Read/write the block from/to the disk that contains the desired
1802 * file block.
1803 */
1804 bp->b_iooffset = dbtob(bp->b_blkno);
1805 bo = dep->de_pmp->pm_bo;
1806 BO_STRATEGY(bo, bp);
1807 return (0);
1808}
1809
1810static int
1811msdosfs_print(ap)
1812 struct vop_print_args /* {
1813 struct vnode *vp;
1814 } */ *ap;
1815{
1816 struct denode *dep = VTODE(ap->a_vp);
1817
1818 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ",
1819 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
1820 printf("on dev (%d, %d)\n", major(dep->de_dev), minor(dep->de_dev));
1821 return (0);
1822}
1823
1824static int
1825msdosfs_pathconf(ap)
1826 struct vop_pathconf_args /* {
1827 struct vnode *a_vp;
1828 int a_name;
1829 int *a_retval;
1830 } */ *ap;
1831{
1832 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp;
1833
1834 switch (ap->a_name) {
1835 case _PC_LINK_MAX:
1836 *ap->a_retval = 1;
1837 return (0);
1838 case _PC_NAME_MAX:
1839 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12;
1840 return (0);
1841 case _PC_PATH_MAX:
1842 *ap->a_retval = PATH_MAX;
1843 return (0);
1844 case _PC_CHOWN_RESTRICTED:
1845 *ap->a_retval = 1;
1846 return (0);
1847 case _PC_NO_TRUNC:
1848 *ap->a_retval = 0;
1849 return (0);
1850 default:
1851 return (EINVAL);
1852 }
1853 /* NOTREACHED */
1854}
1855
1856static int
1857msdosfs_advlock(ap)
1858 struct vop_advlock_args /* {
1859 struct vnode *a_vp;
1860 u_char a_id;
1861 int a_op;
1862 struct flock *a_fl;
1863 int a_flags;
1864 } */ *ap;
1865{
1866 struct denode *dep = VTODE(ap->a_vp);
1867
1868 return (lf_advlock(ap, &dep->de_lockf, dep->de_FileSize));
1869}
1870
1871/* Global vfs data structures for msdosfs */
1872struct vop_vector msdosfs_vnodeops = {
1873 .vop_default = &default_vnodeops,
| 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/lockf.h>
54#include <sys/namei.h>
55#include <sys/resourcevar.h> /* defines plimit structure in proc struct */
56#include <sys/kernel.h>
57#include <sys/stat.h>
58#include <sys/bio.h>
59#include <sys/buf.h>
60#include <sys/proc.h>
61#include <sys/mount.h>
62#include <sys/unistd.h>
63#include <sys/vnode.h>
64#include <sys/malloc.h>
65#include <sys/dirent.h>
66#include <sys/signalvar.h>
67
68#include <vm/vm.h>
69#include <vm/vm_extern.h>
70#include <vm/vnode_pager.h>
71
72#include <machine/mutex.h>
73
74#include <fs/msdosfs/bpb.h>
75#include <fs/msdosfs/msdosfsmount.h>
76#include <fs/msdosfs/direntry.h>
77#include <fs/msdosfs/denode.h>
78#include <fs/msdosfs/fat.h>
79
80#include "opt_msdosfs.h"
81
82#define DOS_FILESIZE_MAX 0xffffffff
83
84/*
85 * Prototypes for MSDOSFS vnode operations
86 */
87static vop_advlock_t msdosfs_advlock;
88static vop_create_t msdosfs_create;
89static vop_mknod_t msdosfs_mknod;
90static vop_close_t msdosfs_close;
91static vop_access_t msdosfs_access;
92static vop_getattr_t msdosfs_getattr;
93static vop_setattr_t msdosfs_setattr;
94static vop_read_t msdosfs_read;
95static vop_write_t msdosfs_write;
96static vop_fsync_t msdosfs_fsync;
97static vop_remove_t msdosfs_remove;
98static vop_link_t msdosfs_link;
99static vop_rename_t msdosfs_rename;
100static vop_mkdir_t msdosfs_mkdir;
101static vop_rmdir_t msdosfs_rmdir;
102static vop_symlink_t msdosfs_symlink;
103static vop_readdir_t msdosfs_readdir;
104static vop_bmap_t msdosfs_bmap;
105static vop_strategy_t msdosfs_strategy;
106static vop_print_t msdosfs_print;
107static vop_pathconf_t msdosfs_pathconf;
108
109/*
110 * Some general notes:
111 *
112 * In the ufs filesystem the inodes, superblocks, and indirect blocks are
113 * read/written using the vnode for the filesystem. Blocks that represent
114 * the contents of a file are read/written using the vnode for the file
115 * (including directories when they are read/written as files). This
116 * presents problems for the dos filesystem because data that should be in
117 * an inode (if dos had them) resides in the directory itself. Since we
118 * must update directory entries without the benefit of having the vnode
119 * for the directory we must use the vnode for the filesystem. This means
120 * that when a directory is actually read/written (via read, write, or
121 * readdir, or seek) we must use the vnode for the filesystem instead of
122 * the vnode for the directory as would happen in ufs. This is to insure we
123 * retreive the correct block from the buffer cache since the hash value is
124 * based upon the vnode address and the desired block number.
125 */
126
127/*
128 * Create a regular file. On entry the directory to contain the file being
129 * created is locked. We must release before we return. We must also free
130 * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or
131 * only if the SAVESTART bit in cn_flags is clear on success.
132 */
133static int
134msdosfs_create(ap)
135 struct vop_create_args /* {
136 struct vnode *a_dvp;
137 struct vnode **a_vpp;
138 struct componentname *a_cnp;
139 struct vattr *a_vap;
140 } */ *ap;
141{
142 struct componentname *cnp = ap->a_cnp;
143 struct denode ndirent;
144 struct denode *dep;
145 struct denode *pdep = VTODE(ap->a_dvp);
146 struct timespec ts;
147 int error;
148
149#ifdef MSDOSFS_DEBUG
150 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap);
151#endif
152
153 /*
154 * If this is the root directory and there is no space left we
155 * can't do anything. This is because the root directory can not
156 * change size.
157 */
158 if (pdep->de_StartCluster == MSDOSFSROOT
159 && pdep->de_fndoffset >= pdep->de_FileSize) {
160 error = ENOSPC;
161 goto bad;
162 }
163
164 /*
165 * Create a directory entry for the file, then call createde() to
166 * have it installed. NOTE: DOS files are always executable. We
167 * use the absence of the owner write bit to make the file
168 * readonly.
169 */
170#ifdef DIAGNOSTIC
171 if ((cnp->cn_flags & HASBUF) == 0)
172 panic("msdosfs_create: no name");
173#endif
174 bzero(&ndirent, sizeof(ndirent));
175 error = uniqdosname(pdep, cnp, ndirent.de_Name);
176 if (error)
177 goto bad;
178
179 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ?
180 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY;
181 ndirent.de_LowerCase = 0;
182 ndirent.de_StartCluster = 0;
183 ndirent.de_FileSize = 0;
184 ndirent.de_dev = pdep->de_dev;
185 ndirent.de_pmp = pdep->de_pmp;
186 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
187 getnanotime(&ts);
188 DETIMES(&ndirent, &ts, &ts, &ts);
189 error = createde(&ndirent, pdep, &dep, cnp);
190 if (error)
191 goto bad;
192 *ap->a_vpp = DETOV(dep);
193 return (0);
194
195bad:
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 return (EINVAL);
209}
210
211static int
212msdosfs_close(ap)
213 struct vop_close_args /* {
214 struct vnode *a_vp;
215 int a_fflag;
216 struct ucred *a_cred;
217 struct thread *a_td;
218 } */ *ap;
219{
220 struct vnode *vp = ap->a_vp;
221 struct denode *dep = VTODE(vp);
222 struct timespec ts;
223
224 VI_LOCK(vp);
225 if (vp->v_usecount > 1) {
226 getnanotime(&ts);
227 DETIMES(dep, &ts, &ts, &ts);
228 }
229 VI_UNLOCK(vp);
230 return 0;
231}
232
233static int
234msdosfs_access(ap)
235 struct vop_access_args /* {
236 struct vnode *a_vp;
237 int a_mode;
238 struct ucred *a_cred;
239 struct thread *a_td;
240 } */ *ap;
241{
242 struct vnode *vp = ap->a_vp;
243 struct denode *dep = VTODE(ap->a_vp);
244 struct msdosfsmount *pmp = dep->de_pmp;
245 mode_t file_mode, mode = ap->a_mode;
246
247 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) |
248 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH));
249 file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
250
251 /*
252 * Disallow write attempts on read-only filesystems;
253 * unless the file is a socket, fifo, or a block or
254 * character device resident on the filesystem.
255 */
256 if (mode & VWRITE) {
257 switch (vp->v_type) {
258 case VDIR:
259 case VLNK:
260 case VREG:
261 if (vp->v_mount->mnt_flag & MNT_RDONLY)
262 return (EROFS);
263 break;
264 default:
265 break;
266 }
267 }
268
269 return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid,
270 ap->a_mode, ap->a_cred, NULL));
271}
272
273static int
274msdosfs_getattr(ap)
275 struct vop_getattr_args /* {
276 struct vnode *a_vp;
277 struct vattr *a_vap;
278 struct ucred *a_cred;
279 struct thread *a_td;
280 } */ *ap;
281{
282 struct denode *dep = VTODE(ap->a_vp);
283 struct msdosfsmount *pmp = dep->de_pmp;
284 struct vattr *vap = ap->a_vap;
285 mode_t mode;
286 struct timespec ts;
287 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
288 uint64_t fileid;
289
290 getnanotime(&ts);
291 DETIMES(dep, &ts, &ts, &ts);
292 vap->va_fsid = dev2udev(dep->de_dev);
293 /*
294 * The following computation of the fileid must be the same as that
295 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
296 * doesn't work.
297 */
298 if (dep->de_Attributes & ATTR_DIRECTORY) {
299 fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) *
300 dirsperblk;
301 if (dep->de_StartCluster == MSDOSFSROOT)
302 fileid = 1;
303 } else {
304 fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) *
305 dirsperblk;
306 if (dep->de_dirclust == MSDOSFSROOT)
307 fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk;
308 fileid += (uint64_t)dep->de_diroffset / sizeof(struct direntry);
309 }
310#ifdef MSDOSFS_LARGE
311 vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid);
312#else
313 vap->va_fileid = (long)fileid;
314#endif
315 if ((dep->de_Attributes & ATTR_READONLY) == 0)
316 mode = S_IRWXU|S_IRWXG|S_IRWXO;
317 else
318 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
319 vap->va_mode = mode &
320 (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask);
321 vap->va_uid = pmp->pm_uid;
322 vap->va_gid = pmp->pm_gid;
323 vap->va_nlink = 1;
324 vap->va_rdev = 0;
325 vap->va_size = dep->de_FileSize;
326 dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime);
327 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
328 dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime);
329 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, &vap->va_ctime);
330 } else {
331 vap->va_atime = vap->va_mtime;
332 vap->va_ctime = vap->va_mtime;
333 }
334 vap->va_flags = 0;
335 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0)
336 vap->va_flags |= SF_ARCHIVED;
337 vap->va_gen = 0;
338 vap->va_blocksize = pmp->pm_bpcluster;
339 vap->va_bytes =
340 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
341 vap->va_type = ap->a_vp->v_type;
342 vap->va_filerev = dep->de_modrev;
343 return (0);
344}
345
346static int
347msdosfs_setattr(ap)
348 struct vop_setattr_args /* {
349 struct vnode *a_vp;
350 struct vattr *a_vap;
351 struct ucred *a_cred;
352 struct thread *a_td;
353 } */ *ap;
354{
355 struct vnode *vp = ap->a_vp;
356 struct denode *dep = VTODE(ap->a_vp);
357 struct msdosfsmount *pmp = dep->de_pmp;
358 struct vattr *vap = ap->a_vap;
359 struct ucred *cred = ap->a_cred;
360 int error = 0;
361
362#ifdef MSDOSFS_DEBUG
363 printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n",
364 ap->a_vp, vap, cred, ap->a_td);
365#endif
366
367 /*
368 * Check for unsettable attributes.
369 */
370 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
371 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
372 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
373 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
374#ifdef MSDOSFS_DEBUG
375 printf("msdosfs_setattr(): returning EINVAL\n");
376 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n",
377 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid);
378 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n",
379 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen);
380 printf(" va_uid %x, va_gid %x\n",
381 vap->va_uid, vap->va_gid);
382#endif
383 return (EINVAL);
384 }
385 if (vap->va_flags != VNOVAL) {
386 if (vp->v_mount->mnt_flag & MNT_RDONLY)
387 return (EROFS);
388 if (cred->cr_uid != pmp->pm_uid &&
389 (error = suser_cred(cred, SUSER_ALLOWJAIL)))
390 return (error);
391 /*
392 * We are very inconsistent about handling unsupported
393 * attributes. We ignored the access time and the
394 * read and execute bits. We were strict for the other
395 * attributes.
396 *
397 * Here we are strict, stricter than ufs in not allowing
398 * users to attempt to set SF_SETTABLE bits or anyone to
399 * set unsupported bits. However, we ignore attempts to
400 * set ATTR_ARCHIVE for directories `cp -pr' from a more
401 * sensible filesystem attempts it a lot.
402 */
403 if (suser_cred(cred, SUSER_ALLOWJAIL)) {
404 if (vap->va_flags & SF_SETTABLE)
405 return EPERM;
406 }
407 if (vap->va_flags & ~SF_ARCHIVED)
408 return EOPNOTSUPP;
409 if (vap->va_flags & SF_ARCHIVED)
410 dep->de_Attributes &= ~ATTR_ARCHIVE;
411 else if (!(dep->de_Attributes & ATTR_DIRECTORY))
412 dep->de_Attributes |= ATTR_ARCHIVE;
413 dep->de_flag |= DE_MODIFIED;
414 }
415
416 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
417 uid_t uid;
418 gid_t gid;
419
420 if (vp->v_mount->mnt_flag & MNT_RDONLY)
421 return (EROFS);
422 uid = vap->va_uid;
423 if (uid == (uid_t)VNOVAL)
424 uid = pmp->pm_uid;
425 gid = vap->va_gid;
426 if (gid == (gid_t)VNOVAL)
427 gid = pmp->pm_gid;
428 if ((cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid ||
429 (gid != pmp->pm_gid && !groupmember(gid, cred))) &&
430 (error = suser_cred(cred, SUSER_ALLOWJAIL)))
431 return error;
432 if (uid != pmp->pm_uid || gid != pmp->pm_gid)
433 return EINVAL;
434 }
435
436 if (vap->va_size != VNOVAL) {
437 /*
438 * Disallow write attempts on read-only filesystems;
439 * unless the file is a socket, fifo, or a block or
440 * character device resident on the filesystem.
441 */
442 switch (vp->v_type) {
443 case VDIR:
444 return (EISDIR);
445 /* NOT REACHED */
446 case VLNK:
447 case VREG:
448 if (vp->v_mount->mnt_flag & MNT_RDONLY)
449 return (EROFS);
450 break;
451 default:
452 break;
453 }
454 error = detrunc(dep, vap->va_size, 0, cred, ap->a_td);
455 if (error)
456 return error;
457 }
458 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
459 if (vp->v_mount->mnt_flag & MNT_RDONLY)
460 return (EROFS);
461 if (cred->cr_uid != pmp->pm_uid &&
462 (error = suser_cred(cred, SUSER_ALLOWJAIL)) &&
463 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
464 (error = VOP_ACCESS(ap->a_vp, VWRITE, cred, ap->a_td))))
465 return (error);
466 if (vp->v_type != VDIR) {
467 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 &&
468 vap->va_atime.tv_sec != VNOVAL) {
469 dep->de_flag &= ~DE_ACCESS;
470 unix2dostime(&vap->va_atime, &dep->de_ADate,
471 NULL, NULL);
472 }
473 if (vap->va_mtime.tv_sec != VNOVAL) {
474 dep->de_flag &= ~DE_UPDATE;
475 unix2dostime(&vap->va_mtime, &dep->de_MDate,
476 &dep->de_MTime, NULL);
477 }
478 dep->de_Attributes |= ATTR_ARCHIVE;
479 dep->de_flag |= DE_MODIFIED;
480 }
481 }
482 /*
483 * DOS files only have the ability to have their writability
484 * attribute set, so we use the owner write bit to set the readonly
485 * attribute.
486 */
487 if (vap->va_mode != (mode_t)VNOVAL) {
488 if (vp->v_mount->mnt_flag & MNT_RDONLY)
489 return (EROFS);
490 if (cred->cr_uid != pmp->pm_uid &&
491 (error = suser_cred(cred, SUSER_ALLOWJAIL)))
492 return (error);
493 if (vp->v_type != VDIR) {
494 /* We ignore the read and execute bits. */
495 if (vap->va_mode & VWRITE)
496 dep->de_Attributes &= ~ATTR_READONLY;
497 else
498 dep->de_Attributes |= ATTR_READONLY;
499 dep->de_Attributes |= ATTR_ARCHIVE;
500 dep->de_flag |= DE_MODIFIED;
501 }
502 }
503 return (deupdat(dep, 1));
504}
505
506static int
507msdosfs_read(ap)
508 struct vop_read_args /* {
509 struct vnode *a_vp;
510 struct uio *a_uio;
511 int a_ioflag;
512 struct ucred *a_cred;
513 } */ *ap;
514{
515 int error = 0;
516 int blsize;
517 int isadir;
518 int orig_resid;
519 u_int n;
520 u_long diff;
521 u_long on;
522 daddr_t lbn;
523 daddr_t rablock;
524 int rasize;
525 int seqcount;
526 struct buf *bp;
527 struct vnode *vp = ap->a_vp;
528 struct denode *dep = VTODE(vp);
529 struct msdosfsmount *pmp = dep->de_pmp;
530 struct uio *uio = ap->a_uio;
531
532 if (uio->uio_offset < 0)
533 return (EINVAL);
534
535 if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX)
536 return (0);
537 /*
538 * If they didn't ask for any data, then we are done.
539 */
540 orig_resid = uio->uio_resid;
541 if (orig_resid <= 0)
542 return (0);
543
544 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
545
546 isadir = dep->de_Attributes & ATTR_DIRECTORY;
547 do {
548 if (uio->uio_offset >= dep->de_FileSize)
549 break;
550 lbn = de_cluster(pmp, uio->uio_offset);
551 /*
552 * If we are operating on a directory file then be sure to
553 * do i/o with the vnode for the filesystem instead of the
554 * vnode for the directory.
555 */
556 if (isadir) {
557 /* convert cluster # to block # */
558 error = pcbmap(dep, lbn, &lbn, 0, &blsize);
559 if (error == E2BIG) {
560 error = EINVAL;
561 break;
562 } else if (error)
563 break;
564 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp);
565 } else {
566 blsize = pmp->pm_bpcluster;
567 rablock = lbn + 1;
568 if (seqcount > 1 &&
569 de_cn2off(pmp, rablock) < dep->de_FileSize) {
570 rasize = pmp->pm_bpcluster;
571 error = breadn(vp, lbn, blsize,
572 &rablock, &rasize, 1, NOCRED, &bp);
573 } else {
574 error = bread(vp, lbn, blsize, NOCRED, &bp);
575 }
576 }
577 if (error) {
578 brelse(bp);
579 break;
580 }
581 on = uio->uio_offset & pmp->pm_crbomask;
582 diff = pmp->pm_bpcluster - on;
583 n = diff > uio->uio_resid ? uio->uio_resid : diff;
584 diff = dep->de_FileSize - uio->uio_offset;
585 if (diff < n)
586 n = diff;
587 diff = blsize - bp->b_resid;
588 if (diff < n)
589 n = diff;
590 error = uiomove(bp->b_data + on, (int) n, uio);
591 brelse(bp);
592 } while (error == 0 && uio->uio_resid > 0 && n != 0);
593 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) &&
594 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
595 dep->de_flag |= DE_ACCESS;
596 return (error);
597}
598
599/*
600 * Write data to a file or directory.
601 */
602static int
603msdosfs_write(ap)
604 struct vop_write_args /* {
605 struct vnode *a_vp;
606 struct uio *a_uio;
607 int a_ioflag;
608 struct ucred *a_cred;
609 } */ *ap;
610{
611 int n;
612 int croffset;
613 int resid;
614 u_long osize;
615 int error = 0;
616 u_long count;
617 daddr_t bn, lastcn;
618 struct buf *bp;
619 int ioflag = ap->a_ioflag;
620 struct uio *uio = ap->a_uio;
621 struct thread *td = uio->uio_td;
622 struct vnode *vp = ap->a_vp;
623 struct vnode *thisvp;
624 struct denode *dep = VTODE(vp);
625 struct msdosfsmount *pmp = dep->de_pmp;
626 struct ucred *cred = ap->a_cred;
627
628#ifdef MSDOSFS_DEBUG
629 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
630 vp, uio, ioflag, cred);
631 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
632 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
633#endif
634
635 switch (vp->v_type) {
636 case VREG:
637 if (ioflag & IO_APPEND)
638 uio->uio_offset = dep->de_FileSize;
639 thisvp = vp;
640 break;
641 case VDIR:
642 return EISDIR;
643 default:
644 panic("msdosfs_write(): bad file type");
645 }
646
647 if (uio->uio_offset < 0)
648 return (EFBIG);
649
650 if (uio->uio_resid == 0)
651 return (0);
652
653 /*
654 * If they've exceeded their filesize limit, tell them about it.
655 */
656 if (td != NULL) {
657 PROC_LOCK(td->td_proc);
658 if ((uoff_t)uio->uio_offset + uio->uio_resid >
659 lim_cur(td->td_proc, RLIMIT_FSIZE)) {
660 psignal(td->td_proc, SIGXFSZ);
661 PROC_UNLOCK(td->td_proc);
662 return (EFBIG);
663 }
664 PROC_UNLOCK(td->td_proc);
665 }
666
667 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX)
668 return (EFBIG);
669
670 /*
671 * If the offset we are starting the write at is beyond the end of
672 * the file, then they've done a seek. Unix filesystems allow
673 * files with holes in them, DOS doesn't so we must fill the hole
674 * with zeroed blocks.
675 */
676 if (uio->uio_offset > dep->de_FileSize) {
677 error = deextend(dep, uio->uio_offset, cred);
678 if (error)
679 return (error);
680 }
681
682 /*
683 * Remember some values in case the write fails.
684 */
685 resid = uio->uio_resid;
686 osize = dep->de_FileSize;
687
688 /*
689 * If we write beyond the end of the file, extend it to its ultimate
690 * size ahead of the time to hopefully get a contiguous area.
691 */
692 if (uio->uio_offset + resid > osize) {
693 count = de_clcount(pmp, uio->uio_offset + resid) -
694 de_clcount(pmp, osize);
695 error = extendfile(dep, count, NULL, NULL, 0);
696 if (error && (error != ENOSPC || (ioflag & IO_UNIT)))
697 goto errexit;
698 lastcn = dep->de_fc[FC_LASTFC].fc_frcn;
699 } else
700 lastcn = de_clcount(pmp, osize) - 1;
701
702 do {
703 if (de_cluster(pmp, uio->uio_offset) > lastcn) {
704 error = ENOSPC;
705 break;
706 }
707
708 croffset = uio->uio_offset & pmp->pm_crbomask;
709 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset);
710 if (uio->uio_offset + n > dep->de_FileSize) {
711 dep->de_FileSize = uio->uio_offset + n;
712 /* The object size needs to be set before buffer is allocated */
713 vnode_pager_setsize(vp, dep->de_FileSize);
714 }
715
716 bn = de_cluster(pmp, uio->uio_offset);
717 if ((uio->uio_offset & pmp->pm_crbomask) == 0
718 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid)
719 > de_cluster(pmp, uio->uio_offset)
720 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) {
721 /*
722 * If either the whole cluster gets written,
723 * or we write the cluster from its start beyond EOF,
724 * then no need to read data from disk.
725 */
726 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0);
727 clrbuf(bp);
728 /*
729 * Do the bmap now, since pcbmap needs buffers
730 * for the fat table. (see msdosfs_strategy)
731 */
732 if (bp->b_blkno == bp->b_lblkno) {
733 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0);
734 if (error)
735 bp->b_blkno = -1;
736 else
737 bp->b_blkno = bn;
738 }
739 if (bp->b_blkno == -1) {
740 brelse(bp);
741 if (!error)
742 error = EIO; /* XXX */
743 break;
744 }
745 } else {
746 /*
747 * The block we need to write into exists, so read it in.
748 */
749 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp);
750 if (error) {
751 brelse(bp);
752 break;
753 }
754 }
755
756 /*
757 * Should these vnode_pager_* functions be done on dir
758 * files?
759 */
760
761 /*
762 * Copy the data from user space into the buf header.
763 */
764 error = uiomove(bp->b_data + croffset, n, uio);
765 if (error) {
766 brelse(bp);
767 break;
768 }
769
770 /*
771 * If they want this synchronous then write it and wait for
772 * it. Otherwise, if on a cluster boundary write it
773 * asynchronously so we can move on to the next block
774 * without delay. Otherwise do a delayed write because we
775 * may want to write somemore into the block later.
776 */
777 if (ioflag & IO_SYNC)
778 (void) bwrite(bp);
779 else if (n + croffset == pmp->pm_bpcluster)
780 bawrite(bp);
781 else
782 bdwrite(bp);
783 dep->de_flag |= DE_UPDATE;
784 } while (error == 0 && uio->uio_resid > 0);
785
786 /*
787 * If the write failed and they want us to, truncate the file back
788 * to the size it was before the write was attempted.
789 */
790errexit:
791 if (error) {
792 if (ioflag & IO_UNIT) {
793 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL);
794 uio->uio_offset -= resid - uio->uio_resid;
795 uio->uio_resid = resid;
796 } else {
797 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL);
798 if (uio->uio_resid != resid)
799 error = 0;
800 }
801 } else if (ioflag & IO_SYNC)
802 error = deupdat(dep, 1);
803 return (error);
804}
805
806/*
807 * Flush the blocks of a file to disk.
808 *
809 * This function is worthless for vnodes that represent directories. Maybe we
810 * could just do a sync if they try an fsync on a directory file.
811 */
812static int
813msdosfs_fsync(ap)
814 struct vop_fsync_args /* {
815 struct vnode *a_vp;
816 struct ucred *a_cred;
817 int a_waitfor;
818 struct thread *a_td;
819 } */ *ap;
820{
821 /*
822 * Flush our dirty buffers.
823 */
824 vop_stdfsync(ap);
825
826 return (deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT));
827}
828
829static int
830msdosfs_remove(ap)
831 struct vop_remove_args /* {
832 struct vnode *a_dvp;
833 struct vnode *a_vp;
834 struct componentname *a_cnp;
835 } */ *ap;
836{
837 struct denode *dep = VTODE(ap->a_vp);
838 struct denode *ddep = VTODE(ap->a_dvp);
839 int error;
840
841 if (ap->a_vp->v_type == VDIR)
842 error = EPERM;
843 else
844 error = removede(ddep, dep);
845#ifdef MSDOSFS_DEBUG
846 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount);
847#endif
848 return (error);
849}
850
851/*
852 * DOS filesystems don't know what links are.
853 */
854static int
855msdosfs_link(ap)
856 struct vop_link_args /* {
857 struct vnode *a_tdvp;
858 struct vnode *a_vp;
859 struct componentname *a_cnp;
860 } */ *ap;
861{
862 return (EOPNOTSUPP);
863}
864
865/*
866 * Renames on files require moving the denode to a new hash queue since the
867 * denode's location is used to compute which hash queue to put the file
868 * in. Unless it is a rename in place. For example "mv a b".
869 *
870 * What follows is the basic algorithm:
871 *
872 * if (file move) {
873 * if (dest file exists) {
874 * remove dest file
875 * }
876 * if (dest and src in same directory) {
877 * rewrite name in existing directory slot
878 * } else {
879 * write new entry in dest directory
880 * update offset and dirclust in denode
881 * move denode to new hash chain
882 * clear old directory entry
883 * }
884 * } else {
885 * directory move
886 * if (dest directory exists) {
887 * if (dest is not empty) {
888 * return ENOTEMPTY
889 * }
890 * remove dest directory
891 * }
892 * if (dest and src in same directory) {
893 * rewrite name in existing entry
894 * } else {
895 * be sure dest is not a child of src directory
896 * write entry in dest directory
897 * update "." and ".." in moved directory
898 * clear old directory entry for moved directory
899 * }
900 * }
901 *
902 * On entry:
903 * source's parent directory is unlocked
904 * source file or directory is unlocked
905 * destination's parent directory is locked
906 * destination file or directory is locked if it exists
907 *
908 * On exit:
909 * all denodes should be released
910 */
911static int
912msdosfs_rename(ap)
913 struct vop_rename_args /* {
914 struct vnode *a_fdvp;
915 struct vnode *a_fvp;
916 struct componentname *a_fcnp;
917 struct vnode *a_tdvp;
918 struct vnode *a_tvp;
919 struct componentname *a_tcnp;
920 } */ *ap;
921{
922 struct vnode *tdvp = ap->a_tdvp;
923 struct vnode *fvp = ap->a_fvp;
924 struct vnode *fdvp = ap->a_fdvp;
925 struct vnode *tvp = ap->a_tvp;
926 struct componentname *tcnp = ap->a_tcnp;
927 struct componentname *fcnp = ap->a_fcnp;
928 struct thread *td = fcnp->cn_thread;
929 struct denode *ip, *xp, *dp, *zp;
930 u_char toname[11], oldname[11];
931 u_long from_diroffset, to_diroffset;
932 u_char to_count;
933 int doingdirectory = 0, newparent = 0;
934 int error;
935 u_long cn;
936 daddr_t bn;
937 struct denode *fddep; /* from file's parent directory */
938 struct msdosfsmount *pmp;
939 struct direntry *dotdotp;
940 struct buf *bp;
941
942 fddep = VTODE(ap->a_fdvp);
943 pmp = fddep->de_pmp;
944
945 pmp = VFSTOMSDOSFS(fdvp->v_mount);
946
947#ifdef DIAGNOSTIC
948 if ((tcnp->cn_flags & HASBUF) == 0 ||
949 (fcnp->cn_flags & HASBUF) == 0)
950 panic("msdosfs_rename: no name");
951#endif
952 /*
953 * Check for cross-device rename.
954 */
955 if ((fvp->v_mount != tdvp->v_mount) ||
956 (tvp && (fvp->v_mount != tvp->v_mount))) {
957 error = EXDEV;
958abortit:
959 if (tdvp == tvp)
960 vrele(tdvp);
961 else
962 vput(tdvp);
963 if (tvp)
964 vput(tvp);
965 vrele(fdvp);
966 vrele(fvp);
967 return (error);
968 }
969
970 /*
971 * If source and dest are the same, do nothing.
972 */
973 if (tvp == fvp) {
974 error = 0;
975 goto abortit;
976 }
977
978 error = vn_lock(fvp, LK_EXCLUSIVE, td);
979 if (error)
980 goto abortit;
981 dp = VTODE(fdvp);
982 ip = VTODE(fvp);
983
984 /*
985 * Be sure we are not renaming ".", "..", or an alias of ".". This
986 * leads to a crippled directory tree. It's pretty tough to do a
987 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
988 * doesn't work if the ".." entry is missing.
989 */
990 if (ip->de_Attributes & ATTR_DIRECTORY) {
991 /*
992 * Avoid ".", "..", and aliases of "." for obvious reasons.
993 */
994 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
995 dp == ip ||
996 (fcnp->cn_flags & ISDOTDOT) ||
997 (tcnp->cn_flags & ISDOTDOT) ||
998 (ip->de_flag & DE_RENAME)) {
999 VOP_UNLOCK(fvp, 0, td);
1000 error = EINVAL;
1001 goto abortit;
1002 }
1003 ip->de_flag |= DE_RENAME;
1004 doingdirectory++;
1005 }
1006
1007 /*
1008 * When the target exists, both the directory
1009 * and target vnodes are returned locked.
1010 */
1011 dp = VTODE(tdvp);
1012 xp = tvp ? VTODE(tvp) : NULL;
1013 /*
1014 * Remember direntry place to use for destination
1015 */
1016 to_diroffset = dp->de_fndoffset;
1017 to_count = dp->de_fndcnt;
1018
1019 /*
1020 * If ".." must be changed (ie the directory gets a new
1021 * parent) then the source directory must not be in the
1022 * directory heirarchy above the target, as this would
1023 * orphan everything below the source directory. Also
1024 * the user must have write permission in the source so
1025 * as to be able to change "..". We must repeat the call
1026 * to namei, as the parent directory is unlocked by the
1027 * call to doscheckpath().
1028 */
1029 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
1030 VOP_UNLOCK(fvp, 0, td);
1031 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
1032 newparent = 1;
1033 if (doingdirectory && newparent) {
1034 if (error) /* write access check above */
1035 goto bad;
1036 if (xp != NULL)
1037 vput(tvp);
1038 /*
1039 * doscheckpath() vput()'s dp,
1040 * so we have to do a relookup afterwards
1041 */
1042 error = doscheckpath(ip, dp);
1043 if (error)
1044 goto out;
1045 if ((tcnp->cn_flags & SAVESTART) == 0)
1046 panic("msdosfs_rename: lost to startdir");
1047 error = relookup(tdvp, &tvp, tcnp);
1048 if (error)
1049 goto out;
1050 dp = VTODE(tdvp);
1051 xp = tvp ? VTODE(tvp) : NULL;
1052 }
1053
1054 if (xp != NULL) {
1055 /*
1056 * Target must be empty if a directory and have no links
1057 * to it. Also, ensure source and target are compatible
1058 * (both directories, or both not directories).
1059 */
1060 if (xp->de_Attributes & ATTR_DIRECTORY) {
1061 if (!dosdirempty(xp)) {
1062 error = ENOTEMPTY;
1063 goto bad;
1064 }
1065 if (!doingdirectory) {
1066 error = ENOTDIR;
1067 goto bad;
1068 }
1069 cache_purge(tdvp);
1070 } else if (doingdirectory) {
1071 error = EISDIR;
1072 goto bad;
1073 }
1074 error = removede(dp, xp);
1075 if (error)
1076 goto bad;
1077 vput(tvp);
1078 xp = NULL;
1079 }
1080
1081 /*
1082 * Convert the filename in tcnp into a dos filename. We copy this
1083 * into the denode and directory entry for the destination
1084 * file/directory.
1085 */
1086 error = uniqdosname(VTODE(tdvp), tcnp, toname);
1087 if (error)
1088 goto abortit;
1089
1090 /*
1091 * Since from wasn't locked at various places above,
1092 * have to do a relookup here.
1093 */
1094 fcnp->cn_flags &= ~MODMASK;
1095 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1096 if ((fcnp->cn_flags & SAVESTART) == 0)
1097 panic("msdosfs_rename: lost from startdir");
1098 if (!newparent)
1099 VOP_UNLOCK(tdvp, 0, td);
1100 if (relookup(fdvp, &fvp, fcnp) == 0)
1101 vrele(fdvp);
1102 if (fvp == NULL) {
1103 /*
1104 * From name has disappeared.
1105 */
1106 if (doingdirectory)
1107 panic("rename: lost dir entry");
1108 vrele(ap->a_fvp);
1109 if (newparent)
1110 VOP_UNLOCK(tdvp, 0, td);
1111 vrele(tdvp);
1112 return 0;
1113 }
1114 xp = VTODE(fvp);
1115 zp = VTODE(fdvp);
1116 from_diroffset = zp->de_fndoffset;
1117
1118 /*
1119 * Ensure that the directory entry still exists and has not
1120 * changed till now. If the source is a file the entry may
1121 * have been unlinked or renamed. In either case there is
1122 * no further work to be done. If the source is a directory
1123 * then it cannot have been rmdir'ed or renamed; this is
1124 * prohibited by the DE_RENAME flag.
1125 */
1126 if (xp != ip) {
1127 if (doingdirectory)
1128 panic("rename: lost dir entry");
1129 vrele(ap->a_fvp);
1130 VOP_UNLOCK(fvp, 0, td);
1131 if (newparent)
1132 VOP_UNLOCK(fdvp, 0, td);
1133 xp = NULL;
1134 } else {
1135 vrele(fvp);
1136 xp = NULL;
1137
1138 /*
1139 * First write a new entry in the destination
1140 * directory and mark the entry in the source directory
1141 * as deleted. Then move the denode to the correct hash
1142 * chain for its new location in the filesystem. And, if
1143 * we moved a directory, then update its .. entry to point
1144 * to the new parent directory.
1145 */
1146 bcopy(ip->de_Name, oldname, 11);
1147 bcopy(toname, ip->de_Name, 11); /* update denode */
1148 dp->de_fndoffset = to_diroffset;
1149 dp->de_fndcnt = to_count;
1150 error = createde(ip, dp, (struct denode **)0, tcnp);
1151 if (error) {
1152 bcopy(oldname, ip->de_Name, 11);
1153 if (newparent)
1154 VOP_UNLOCK(fdvp, 0, td);
1155 VOP_UNLOCK(fvp, 0, td);
1156 goto bad;
1157 }
1158 ip->de_refcnt++;
1159 zp->de_fndoffset = from_diroffset;
1160 error = removede(zp, ip);
1161 if (error) {
1162 /* XXX should really panic here, fs is corrupt */
1163 if (newparent)
1164 VOP_UNLOCK(fdvp, 0, td);
1165 VOP_UNLOCK(fvp, 0, td);
1166 goto bad;
1167 }
1168 if (!doingdirectory) {
1169 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0,
1170 &ip->de_dirclust, 0);
1171 if (error) {
1172 /* XXX should really panic here, fs is corrupt */
1173 if (newparent)
1174 VOP_UNLOCK(fdvp, 0, td);
1175 VOP_UNLOCK(fvp, 0, td);
1176 goto bad;
1177 }
1178 if (ip->de_dirclust == MSDOSFSROOT)
1179 ip->de_diroffset = to_diroffset;
1180 else
1181 ip->de_diroffset = to_diroffset & pmp->pm_crbomask;
1182 }
1183 reinsert(ip);
1184 if (newparent)
1185 VOP_UNLOCK(fdvp, 0, td);
1186 }
1187
1188 /*
1189 * If we moved a directory to a new parent directory, then we must
1190 * fixup the ".." entry in the moved directory.
1191 */
1192 if (doingdirectory && newparent) {
1193 cn = ip->de_StartCluster;
1194 if (cn == MSDOSFSROOT) {
1195 /* this should never happen */
1196 panic("msdosfs_rename(): updating .. in root directory?");
1197 } else
1198 bn = cntobn(pmp, cn);
1199 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
1200 NOCRED, &bp);
1201 if (error) {
1202 /* XXX should really panic here, fs is corrupt */
1203 brelse(bp);
1204 VOP_UNLOCK(fvp, 0, td);
1205 goto bad;
1206 }
1207 dotdotp = (struct direntry *)bp->b_data + 1;
1208 putushort(dotdotp->deStartCluster, dp->de_StartCluster);
1209 if (FAT32(pmp))
1210 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16);
1211 error = bwrite(bp);
1212 if (error) {
1213 /* XXX should really panic here, fs is corrupt */
1214 VOP_UNLOCK(fvp, 0, td);
1215 goto bad;
1216 }
1217 }
1218
1219 VOP_UNLOCK(fvp, 0, td);
1220bad:
1221 if (xp)
1222 vput(tvp);
1223 vput(tdvp);
1224out:
1225 ip->de_flag &= ~DE_RENAME;
1226 vrele(fdvp);
1227 vrele(fvp);
1228 return (error);
1229
1230}
1231
1232static struct {
1233 struct direntry dot;
1234 struct direntry dotdot;
1235} dosdirtemplate = {
1236 { ". ", " ", /* the . entry */
1237 ATTR_DIRECTORY, /* file attribute */
1238 0, /* reserved */
1239 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1240 { 0, 0 }, /* access date */
1241 { 0, 0 }, /* high bits of start cluster */
1242 { 210, 4 }, { 210, 4 }, /* modify time & date */
1243 { 0, 0 }, /* startcluster */
1244 { 0, 0, 0, 0 } /* filesize */
1245 },
1246 { ".. ", " ", /* the .. entry */
1247 ATTR_DIRECTORY, /* file attribute */
1248 0, /* reserved */
1249 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1250 { 0, 0 }, /* access date */
1251 { 0, 0 }, /* high bits of start cluster */
1252 { 210, 4 }, { 210, 4 }, /* modify time & date */
1253 { 0, 0 }, /* startcluster */
1254 { 0, 0, 0, 0 } /* filesize */
1255 }
1256};
1257
1258static int
1259msdosfs_mkdir(ap)
1260 struct vop_mkdir_args /* {
1261 struct vnode *a_dvp;
1262 struvt vnode **a_vpp;
1263 struvt componentname *a_cnp;
1264 struct vattr *a_vap;
1265 } */ *ap;
1266{
1267 struct componentname *cnp = ap->a_cnp;
1268 struct denode *dep;
1269 struct denode *pdep = VTODE(ap->a_dvp);
1270 struct direntry *denp;
1271 struct msdosfsmount *pmp = pdep->de_pmp;
1272 struct buf *bp;
1273 u_long newcluster, pcl;
1274 int bn;
1275 int error;
1276 struct denode ndirent;
1277 struct timespec ts;
1278
1279 /*
1280 * If this is the root directory and there is no space left we
1281 * can't do anything. This is because the root directory can not
1282 * change size.
1283 */
1284 if (pdep->de_StartCluster == MSDOSFSROOT
1285 && pdep->de_fndoffset >= pdep->de_FileSize) {
1286 error = ENOSPC;
1287 goto bad2;
1288 }
1289
1290 /*
1291 * Allocate a cluster to hold the about to be created directory.
1292 */
1293 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL);
1294 if (error)
1295 goto bad2;
1296
1297 bzero(&ndirent, sizeof(ndirent));
1298 ndirent.de_pmp = pmp;
1299 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1300 getnanotime(&ts);
1301 DETIMES(&ndirent, &ts, &ts, &ts);
1302
1303 /*
1304 * Now fill the cluster with the "." and ".." entries. And write
1305 * the cluster to disk. This way it is there for the parent
1306 * directory to be pointing at if there were a crash.
1307 */
1308 bn = cntobn(pmp, newcluster);
1309 /* always succeeds */
1310 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0);
1311 bzero(bp->b_data, pmp->pm_bpcluster);
1312 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate);
1313 denp = (struct direntry *)bp->b_data;
1314 putushort(denp[0].deStartCluster, newcluster);
1315 putushort(denp[0].deCDate, ndirent.de_CDate);
1316 putushort(denp[0].deCTime, ndirent.de_CTime);
1317 denp[0].deCHundredth = ndirent.de_CHun;
1318 putushort(denp[0].deADate, ndirent.de_ADate);
1319 putushort(denp[0].deMDate, ndirent.de_MDate);
1320 putushort(denp[0].deMTime, ndirent.de_MTime);
1321 pcl = pdep->de_StartCluster;
1322 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1323 pcl = 0;
1324 putushort(denp[1].deStartCluster, pcl);
1325 putushort(denp[1].deCDate, ndirent.de_CDate);
1326 putushort(denp[1].deCTime, ndirent.de_CTime);
1327 denp[1].deCHundredth = ndirent.de_CHun;
1328 putushort(denp[1].deADate, ndirent.de_ADate);
1329 putushort(denp[1].deMDate, ndirent.de_MDate);
1330 putushort(denp[1].deMTime, ndirent.de_MTime);
1331 if (FAT32(pmp)) {
1332 putushort(denp[0].deHighClust, newcluster >> 16);
1333 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16);
1334 }
1335
1336 error = bwrite(bp);
1337 if (error)
1338 goto bad;
1339
1340 /*
1341 * Now build up a directory entry pointing to the newly allocated
1342 * cluster. This will be written to an empty slot in the parent
1343 * directory.
1344 */
1345#ifdef DIAGNOSTIC
1346 if ((cnp->cn_flags & HASBUF) == 0)
1347 panic("msdosfs_mkdir: no name");
1348#endif
1349 error = uniqdosname(pdep, cnp, ndirent.de_Name);
1350 if (error)
1351 goto bad;
1352
1353 ndirent.de_Attributes = ATTR_DIRECTORY;
1354 ndirent.de_LowerCase = 0;
1355 ndirent.de_StartCluster = newcluster;
1356 ndirent.de_FileSize = 0;
1357 ndirent.de_dev = pdep->de_dev;
1358 error = createde(&ndirent, pdep, &dep, cnp);
1359 if (error)
1360 goto bad;
1361 *ap->a_vpp = DETOV(dep);
1362 return (0);
1363
1364bad:
1365 clusterfree(pmp, newcluster, NULL);
1366bad2:
1367 return (error);
1368}
1369
1370static int
1371msdosfs_rmdir(ap)
1372 struct vop_rmdir_args /* {
1373 struct vnode *a_dvp;
1374 struct vnode *a_vp;
1375 struct componentname *a_cnp;
1376 } */ *ap;
1377{
1378 struct vnode *vp = ap->a_vp;
1379 struct vnode *dvp = ap->a_dvp;
1380 struct componentname *cnp = ap->a_cnp;
1381 struct denode *ip, *dp;
1382 struct thread *td = cnp->cn_thread;
1383 int error;
1384
1385 ip = VTODE(vp);
1386 dp = VTODE(dvp);
1387
1388 /*
1389 * Verify the directory is empty (and valid).
1390 * (Rmdir ".." won't be valid since
1391 * ".." will contain a reference to
1392 * the current directory and thus be
1393 * non-empty.)
1394 */
1395 error = 0;
1396 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) {
1397 error = ENOTEMPTY;
1398 goto out;
1399 }
1400 /*
1401 * Delete the entry from the directory. For dos filesystems this
1402 * gets rid of the directory entry on disk, the in memory copy
1403 * still exists but the de_refcnt is <= 0. This prevents it from
1404 * being found by deget(). When the vput() on dep is done we give
1405 * up access and eventually msdosfs_reclaim() will be called which
1406 * will remove it from the denode cache.
1407 */
1408 error = removede(dp, ip);
1409 if (error)
1410 goto out;
1411 /*
1412 * This is where we decrement the link count in the parent
1413 * directory. Since dos filesystems don't do this we just purge
1414 * the name cache.
1415 */
1416 cache_purge(dvp);
1417 VOP_UNLOCK(dvp, 0, td);
1418 /*
1419 * Truncate the directory that is being deleted.
1420 */
1421 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, td);
1422 cache_purge(vp);
1423
1424 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
1425out:
1426 return (error);
1427}
1428
1429/*
1430 * DOS filesystems don't know what symlinks are.
1431 */
1432static int
1433msdosfs_symlink(ap)
1434 struct vop_symlink_args /* {
1435 struct vnode *a_dvp;
1436 struct vnode **a_vpp;
1437 struct componentname *a_cnp;
1438 struct vattr *a_vap;
1439 char *a_target;
1440 } */ *ap;
1441{
1442 return (EOPNOTSUPP);
1443}
1444
1445static int
1446msdosfs_readdir(ap)
1447 struct vop_readdir_args /* {
1448 struct vnode *a_vp;
1449 struct uio *a_uio;
1450 struct ucred *a_cred;
1451 int *a_eofflag;
1452 int *a_ncookies;
1453 u_long **a_cookies;
1454 } */ *ap;
1455{
1456 int error = 0;
1457 int diff;
1458 long n;
1459 int blsize;
1460 long on;
1461 u_long cn;
1462 uint64_t fileno;
1463 u_long dirsperblk;
1464 long bias = 0;
1465 daddr_t bn, lbn;
1466 struct buf *bp;
1467 struct denode *dep = VTODE(ap->a_vp);
1468 struct msdosfsmount *pmp = dep->de_pmp;
1469 struct direntry *dentp;
1470 struct dirent dirbuf;
1471 struct uio *uio = ap->a_uio;
1472 u_long *cookies = NULL;
1473 int ncookies = 0;
1474 off_t offset, off;
1475 int chksum = -1;
1476
1477#ifdef MSDOSFS_DEBUG
1478 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
1479 ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
1480#endif
1481
1482 /*
1483 * msdosfs_readdir() won't operate properly on regular files since
1484 * it does i/o only with the the filesystem vnode, and hence can
1485 * retrieve the wrong block from the buffer cache for a plain file.
1486 * So, fail attempts to readdir() on a plain file.
1487 */
1488 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
1489 return (ENOTDIR);
1490
1491 /*
1492 * To be safe, initialize dirbuf
1493 */
1494 bzero(dirbuf.d_name, sizeof(dirbuf.d_name));
1495
1496 /*
1497 * If the user buffer is smaller than the size of one dos directory
1498 * entry or the file offset is not a multiple of the size of a
1499 * directory entry, then we fail the read.
1500 */
1501 off = offset = uio->uio_offset;
1502 if (uio->uio_resid < sizeof(struct direntry) ||
1503 (offset & (sizeof(struct direntry) - 1)))
1504 return (EINVAL);
1505
1506 if (ap->a_ncookies) {
1507 ncookies = uio->uio_resid / 16;
1508 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP,
1509 M_WAITOK);
1510 *ap->a_cookies = cookies;
1511 *ap->a_ncookies = ncookies;
1512 }
1513
1514 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1515
1516 /*
1517 * If they are reading from the root directory then, we simulate
1518 * the . and .. entries since these don't exist in the root
1519 * directory. We also set the offset bias to make up for having to
1520 * simulate these entries. By this I mean that at file offset 64 we
1521 * read the first entry in the root directory that lives on disk.
1522 */
1523 if (dep->de_StartCluster == MSDOSFSROOT
1524 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
1525#if 0
1526 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n",
1527 offset);
1528#endif
1529 bias = 2 * sizeof(struct direntry);
1530 if (offset < bias) {
1531 for (n = (int)offset / sizeof(struct direntry);
1532 n < 2; n++) {
1533 if (FAT32(pmp))
1534 fileno = (uint64_t)cntobn(pmp,
1535 pmp->pm_rootdirblk)
1536 * dirsperblk;
1537 else
1538 fileno = 1;
1539#ifdef MSDOSFS_LARGE
1540 dirbuf.d_fileno = msdosfs_fileno_map(
1541 pmp->pm_mountp, fileno);
1542#else
1543 dirbuf.d_fileno = (uint32_t)fileno;
1544#endif
1545 dirbuf.d_type = DT_DIR;
1546 switch (n) {
1547 case 0:
1548 dirbuf.d_namlen = 1;
1549 strcpy(dirbuf.d_name, ".");
1550 break;
1551 case 1:
1552 dirbuf.d_namlen = 2;
1553 strcpy(dirbuf.d_name, "..");
1554 break;
1555 }
1556 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1557 if (uio->uio_resid < dirbuf.d_reclen)
1558 goto out;
1559 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1560 if (error)
1561 goto out;
1562 offset += sizeof(struct direntry);
1563 off = offset;
1564 if (cookies) {
1565 *cookies++ = offset;
1566 if (--ncookies <= 0)
1567 goto out;
1568 }
1569 }
1570 }
1571 }
1572
1573 mbnambuf_init();
1574 off = offset;
1575 while (uio->uio_resid > 0) {
1576 lbn = de_cluster(pmp, offset - bias);
1577 on = (offset - bias) & pmp->pm_crbomask;
1578 n = min(pmp->pm_bpcluster - on, uio->uio_resid);
1579 diff = dep->de_FileSize - (offset - bias);
1580 if (diff <= 0)
1581 break;
1582 n = min(n, diff);
1583 error = pcbmap(dep, lbn, &bn, &cn, &blsize);
1584 if (error)
1585 break;
1586 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp);
1587 if (error) {
1588 brelse(bp);
1589 return (error);
1590 }
1591 n = min(n, blsize - bp->b_resid);
1592 if (n == 0) {
1593 brelse(bp);
1594 return (EIO);
1595 }
1596
1597 /*
1598 * Convert from dos directory entries to fs-independent
1599 * directory entries.
1600 */
1601 for (dentp = (struct direntry *)(bp->b_data + on);
1602 (char *)dentp < bp->b_data + on + n;
1603 dentp++, offset += sizeof(struct direntry)) {
1604#if 0
1605 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
1606 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
1607#endif
1608 /*
1609 * If this is an unused entry, we can stop.
1610 */
1611 if (dentp->deName[0] == SLOT_EMPTY) {
1612 brelse(bp);
1613 goto out;
1614 }
1615 /*
1616 * Skip deleted entries.
1617 */
1618 if (dentp->deName[0] == SLOT_DELETED) {
1619 chksum = -1;
1620 mbnambuf_init();
1621 continue;
1622 }
1623
1624 /*
1625 * Handle Win95 long directory entries
1626 */
1627 if (dentp->deAttributes == ATTR_WIN95) {
1628 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
1629 continue;
1630 chksum = win2unixfn((struct winentry *)dentp,
1631 chksum, pmp);
1632 continue;
1633 }
1634
1635 /*
1636 * Skip volume labels
1637 */
1638 if (dentp->deAttributes & ATTR_VOLUME) {
1639 chksum = -1;
1640 mbnambuf_init();
1641 continue;
1642 }
1643 /*
1644 * This computation of d_fileno must match
1645 * the computation of va_fileid in
1646 * msdosfs_getattr.
1647 */
1648 if (dentp->deAttributes & ATTR_DIRECTORY) {
1649 fileno = getushort(dentp->deStartCluster);
1650 if (FAT32(pmp))
1651 fileno |= getushort(dentp->deHighClust) << 16;
1652 /* if this is the root directory */
1653 if (fileno == MSDOSFSROOT)
1654 if (FAT32(pmp))
1655 fileno = (uint64_t)cntobn(pmp,
1656 pmp->pm_rootdirblk)
1657 * dirsperblk;
1658 else
1659 fileno = 1;
1660 else
1661 fileno = (uint64_t)cntobn(pmp, fileno) *
1662 dirsperblk;
1663 dirbuf.d_type = DT_DIR;
1664 } else {
1665 fileno = (uint64_t)offset / sizeof(struct direntry);
1666 dirbuf.d_type = DT_REG;
1667 }
1668#ifdef MSDOSFS_LARGE
1669 dirbuf.d_fileno = msdosfs_fileno_map(pmp->pm_mountp,
1670 fileno);
1671#else
1672 dirbuf.d_fileno = (uint32_t)fileno;
1673#endif
1674 if (chksum != winChksum(dentp->deName)) {
1675 dirbuf.d_namlen = dos2unixfn(dentp->deName,
1676 (u_char *)dirbuf.d_name,
1677 dentp->deLowerCase |
1678 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ?
1679 (LCASE_BASE | LCASE_EXT) : 0),
1680 pmp);
1681 mbnambuf_init();
1682 } else
1683 mbnambuf_flush(&dirbuf);
1684 chksum = -1;
1685 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1686 if (uio->uio_resid < dirbuf.d_reclen) {
1687 brelse(bp);
1688 goto out;
1689 }
1690 error = uiomove(&dirbuf, dirbuf.d_reclen, uio);
1691 if (error) {
1692 brelse(bp);
1693 goto out;
1694 }
1695 if (cookies) {
1696 *cookies++ = offset + sizeof(struct direntry);
1697 if (--ncookies <= 0) {
1698 brelse(bp);
1699 goto out;
1700 }
1701 }
1702 off = offset + sizeof(struct direntry);
1703 }
1704 brelse(bp);
1705 }
1706out:
1707 /* Subtract unused cookies */
1708 if (ap->a_ncookies)
1709 *ap->a_ncookies -= ncookies;
1710
1711 uio->uio_offset = off;
1712
1713 /*
1714 * Set the eofflag (NFS uses it)
1715 */
1716 if (ap->a_eofflag) {
1717 if (dep->de_FileSize - (offset - bias) <= 0)
1718 *ap->a_eofflag = 1;
1719 else
1720 *ap->a_eofflag = 0;
1721 }
1722 return (error);
1723}
1724
1725/*
1726 * vp - address of vnode file the file
1727 * bn - which cluster we are interested in mapping to a filesystem block number.
1728 * vpp - returns the vnode for the block special file holding the filesystem
1729 * containing the file of interest
1730 * bnp - address of where to return the filesystem relative block number
1731 */
1732static int
1733msdosfs_bmap(ap)
1734 struct vop_bmap_args /* {
1735 struct vnode *a_vp;
1736 daddr_t a_bn;
1737 struct bufobj **a_bop;
1738 daddr_t *a_bnp;
1739 int *a_runp;
1740 int *a_runb;
1741 } */ *ap;
1742{
1743 struct denode *dep = VTODE(ap->a_vp);
1744 daddr_t blkno;
1745 int error;
1746
1747 if (ap->a_bop != NULL)
1748 *ap->a_bop = &dep->de_pmp->pm_devvp->v_bufobj;
1749 if (ap->a_bnp == NULL)
1750 return (0);
1751 if (ap->a_runp) {
1752 /*
1753 * Sequential clusters should be counted here.
1754 */
1755 *ap->a_runp = 0;
1756 }
1757 if (ap->a_runb) {
1758 *ap->a_runb = 0;
1759 }
1760 error = pcbmap(dep, ap->a_bn, &blkno, 0, 0);
1761 *ap->a_bnp = blkno;
1762 return (error);
1763}
1764
1765static int
1766msdosfs_strategy(ap)
1767 struct vop_strategy_args /* {
1768 struct vnode *a_vp;
1769 struct buf *a_bp;
1770 } */ *ap;
1771{
1772 struct buf *bp = ap->a_bp;
1773 struct denode *dep = VTODE(ap->a_vp);
1774 struct bufobj *bo;
1775 int error = 0;
1776 daddr_t blkno;
1777
1778 /*
1779 * If we don't already know the filesystem relative block number
1780 * then get it using pcbmap(). If pcbmap() returns the block
1781 * number as -1 then we've got a hole in the file. DOS filesystems
1782 * don't allow files with holes, so we shouldn't ever see this.
1783 */
1784 if (bp->b_blkno == bp->b_lblkno) {
1785 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0);
1786 bp->b_blkno = blkno;
1787 if (error) {
1788 bp->b_error = error;
1789 bp->b_ioflags |= BIO_ERROR;
1790 bufdone(bp);
1791 return (error);
1792 }
1793 if ((long)bp->b_blkno == -1)
1794 vfs_bio_clrbuf(bp);
1795 }
1796 if (bp->b_blkno == -1) {
1797 bufdone(bp);
1798 return (0);
1799 }
1800 /*
1801 * Read/write the block from/to the disk that contains the desired
1802 * file block.
1803 */
1804 bp->b_iooffset = dbtob(bp->b_blkno);
1805 bo = dep->de_pmp->pm_bo;
1806 BO_STRATEGY(bo, bp);
1807 return (0);
1808}
1809
1810static int
1811msdosfs_print(ap)
1812 struct vop_print_args /* {
1813 struct vnode *vp;
1814 } */ *ap;
1815{
1816 struct denode *dep = VTODE(ap->a_vp);
1817
1818 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ",
1819 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
1820 printf("on dev (%d, %d)\n", major(dep->de_dev), minor(dep->de_dev));
1821 return (0);
1822}
1823
1824static int
1825msdosfs_pathconf(ap)
1826 struct vop_pathconf_args /* {
1827 struct vnode *a_vp;
1828 int a_name;
1829 int *a_retval;
1830 } */ *ap;
1831{
1832 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp;
1833
1834 switch (ap->a_name) {
1835 case _PC_LINK_MAX:
1836 *ap->a_retval = 1;
1837 return (0);
1838 case _PC_NAME_MAX:
1839 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12;
1840 return (0);
1841 case _PC_PATH_MAX:
1842 *ap->a_retval = PATH_MAX;
1843 return (0);
1844 case _PC_CHOWN_RESTRICTED:
1845 *ap->a_retval = 1;
1846 return (0);
1847 case _PC_NO_TRUNC:
1848 *ap->a_retval = 0;
1849 return (0);
1850 default:
1851 return (EINVAL);
1852 }
1853 /* NOTREACHED */
1854}
1855
1856static int
1857msdosfs_advlock(ap)
1858 struct vop_advlock_args /* {
1859 struct vnode *a_vp;
1860 u_char a_id;
1861 int a_op;
1862 struct flock *a_fl;
1863 int a_flags;
1864 } */ *ap;
1865{
1866 struct denode *dep = VTODE(ap->a_vp);
1867
1868 return (lf_advlock(ap, &dep->de_lockf, dep->de_FileSize));
1869}
1870
1871/* Global vfs data structures for msdosfs */
1872struct vop_vector msdosfs_vnodeops = {
1873 .vop_default = &default_vnodeops,
|