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[dragonfly.git] / sys / vfs / msdosfs / msdosfs_vnops.c
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984263bc 1/* $FreeBSD: src/sys/msdosfs/msdosfs_vnops.c,v 1.95.2.4 2003/06/13 15:05:47 trhodes Exp $ */
6bae6177 2/* $DragonFly: src/sys/vfs/msdosfs/msdosfs_vnops.c,v 1.24 2005/04/15 19:08:19 dillon Exp $ */
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3/* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $ */
4
5/*-
6 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
7 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
8 * All rights reserved.
9 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by TooLs GmbH.
22 * 4. The name of TooLs GmbH may not be used to endorse or promote products
23 * derived from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 */
36/*
37 * Written by Paul Popelka (paulp@uts.amdahl.com)
38 *
39 * You can do anything you want with this software, just don't say you wrote
40 * it, and don't remove this notice.
41 *
42 * This software is provided "as is".
43 *
44 * The author supplies this software to be publicly redistributed on the
45 * understanding that the author is not responsible for the correct
46 * functioning of this software in any circumstances and is not liable for
47 * any damages caused by this software.
48 *
49 * October 1992
50 */
51
52#include <sys/param.h>
53#include <sys/systm.h>
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54#include <sys/resourcevar.h> /* defines plimit structure in proc struct */
55#include <sys/kernel.h>
56#include <sys/stat.h>
57#include <sys/buf.h>
58#include <sys/proc.h>
dadab5e9 59#include <sys/namei.h>
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60#include <sys/mount.h>
61#include <sys/unistd.h>
62#include <sys/vnode.h>
63#include <sys/malloc.h>
64#include <sys/dirent.h>
65#include <sys/signalvar.h>
66
67#include <vm/vm.h>
68#include <vm/vm_extern.h>
69#include <vm/vm_zone.h>
70#include <vm/vnode_pager.h>
71
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72#include <sys/buf2.h>
73
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74#include "bpb.h"
75#include "direntry.h"
76#include "denode.h"
77#include "msdosfsmount.h"
78#include "fat.h"
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79
80#define DOS_FILESIZE_MAX 0xffffffff
81
82/*
83 * Prototypes for MSDOSFS vnode operations
84 */
a6ee311a
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85static int msdosfs_create (struct vop_create_args *);
86static int msdosfs_mknod (struct vop_mknod_args *);
87static int msdosfs_close (struct vop_close_args *);
88static int msdosfs_access (struct vop_access_args *);
89static int msdosfs_getattr (struct vop_getattr_args *);
90static int msdosfs_setattr (struct vop_setattr_args *);
91static int msdosfs_read (struct vop_read_args *);
92static int msdosfs_write (struct vop_write_args *);
93static int msdosfs_fsync (struct vop_fsync_args *);
94static int msdosfs_remove (struct vop_remove_args *);
95static int msdosfs_link (struct vop_link_args *);
96static int msdosfs_rename (struct vop_rename_args *);
97static int msdosfs_mkdir (struct vop_mkdir_args *);
98static int msdosfs_rmdir (struct vop_rmdir_args *);
99static int msdosfs_symlink (struct vop_symlink_args *);
100static int msdosfs_readdir (struct vop_readdir_args *);
101static int msdosfs_bmap (struct vop_bmap_args *);
102static int msdosfs_strategy (struct vop_strategy_args *);
103static int msdosfs_print (struct vop_print_args *);
104static int msdosfs_pathconf (struct vop_pathconf_args *ap);
105static int msdosfs_getpages (struct vop_getpages_args *);
106static int msdosfs_putpages (struct vop_putpages_args *);
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107
108/*
109 * Some general notes:
110 *
111 * In the ufs filesystem the inodes, superblocks, and indirect blocks are
112 * read/written using the vnode for the filesystem. Blocks that represent
113 * the contents of a file are read/written using the vnode for the file
114 * (including directories when they are read/written as files). This
115 * presents problems for the dos filesystem because data that should be in
116 * an inode (if dos had them) resides in the directory itself. Since we
117 * must update directory entries without the benefit of having the vnode
118 * for the directory we must use the vnode for the filesystem. This means
119 * that when a directory is actually read/written (via read, write, or
120 * readdir, or seek) we must use the vnode for the filesystem instead of
121 * the vnode for the directory as would happen in ufs. This is to insure we
122 * retreive the correct block from the buffer cache since the hash value is
123 * based upon the vnode address and the desired block number.
124 */
125
126/*
127 * Create a regular file. On entry the directory to contain the file being
fad57d0e 128 * created is locked. We must release before we return.
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129 *
130 * msdosfs_create(struct vnode *a_dvp, struct vnode **a_vpp,
131 * struct componentname *a_cnp, struct vattr *a_vap)
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132 */
133static int
4625f023 134msdosfs_create(struct vop_create_args *ap)
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135{
136 struct componentname *cnp = ap->a_cnp;
137 struct denode ndirent;
138 struct denode *dep;
139 struct denode *pdep = VTODE(ap->a_dvp);
140 struct timespec ts;
141 int error;
142
143#ifdef MSDOSFS_DEBUG
144 printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap);
145#endif
146
147 /*
148 * If this is the root directory and there is no space left we
149 * can't do anything. This is because the root directory can not
150 * change size.
151 */
152 if (pdep->de_StartCluster == MSDOSFSROOT
153 && pdep->de_fndoffset >= pdep->de_FileSize) {
154 error = ENOSPC;
155 goto bad;
156 }
157
158 /*
159 * Create a directory entry for the file, then call createde() to
160 * have it installed. NOTE: DOS files are always executable. We
161 * use the absence of the owner write bit to make the file
162 * readonly.
163 */
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MD
164 bzero(&ndirent, sizeof(ndirent));
165 error = uniqdosname(pdep, cnp, ndirent.de_Name);
166 if (error)
167 goto bad;
168
169 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ?
170 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY;
171 ndirent.de_LowerCase = 0;
172 ndirent.de_StartCluster = 0;
173 ndirent.de_FileSize = 0;
174 ndirent.de_dev = pdep->de_dev;
175 ndirent.de_devvp = pdep->de_devvp;
176 ndirent.de_pmp = pdep->de_pmp;
177 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
178 getnanotime(&ts);
179 DETIMES(&ndirent, &ts, &ts, &ts);
180 error = createde(&ndirent, pdep, &dep, cnp);
181 if (error)
182 goto bad;
183 *ap->a_vpp = DETOV(dep);
184 return (0);
185
186bad:
187 return (error);
188}
189
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190/*
191 * msdosfs_mknod(struct vnode *a_dvp, struct vnode **a_vpp,
192 * struct componentname *a_cnp, struct vattr *a_vap)
193 */
984263bc 194static int
4625f023 195msdosfs_mknod(struct vop_mknod_args *ap)
984263bc 196{
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197 switch (ap->a_vap->va_type) {
198 case VDIR:
199 return (msdosfs_mkdir((struct vop_mkdir_args *)ap));
200 break;
201
202 case VREG:
203 return (msdosfs_create((struct vop_create_args *)ap));
204 break;
205
206 default:
207 return (EINVAL);
208 }
209 /* NOTREACHED */
210}
211
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212/*
213 * msdosfs_close(struct vnode *a_vp, int a_fflag, struct ucred *a_cred,
214 * struct thread *a_td)
215 */
984263bc 216static int
4625f023 217msdosfs_close(struct vop_close_args *ap)
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218{
219 struct vnode *vp = ap->a_vp;
220 struct denode *dep = VTODE(vp);
221 struct timespec ts;
222
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223 if (vp->v_usecount > 1) {
224 getnanotime(&ts);
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225 if (vp->v_usecount > 1) {
226 DETIMES(dep, &ts, &ts, &ts);
227 }
984263bc 228 }
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229 return 0;
230}
231
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232/*
233 * msdosfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
234 * struct thread *a_td)
235 */
984263bc 236static int
4625f023 237msdosfs_access(struct vop_access_args *ap)
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MD
238{
239 struct vnode *vp = ap->a_vp;
240 struct denode *dep = VTODE(ap->a_vp);
241 struct msdosfsmount *pmp = dep->de_pmp;
242 struct ucred *cred = ap->a_cred;
243 mode_t mask, file_mode, mode = ap->a_mode;
0e99e805 244 gid_t *gp;
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245 int i;
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 &= pmp->pm_mask;
250
251 /*
252 * Disallow write attempts on read-only file systems;
253 * unless the file is a socket, fifo, or a block or
254 * character device resident on the file system.
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 /* User id 0 always gets access. */
270 if (cred->cr_uid == 0)
271 return 0;
272
273 mask = 0;
274
275 /* Otherwise, check the owner. */
276 if (cred->cr_uid == pmp->pm_uid) {
277 if (mode & VEXEC)
278 mask |= S_IXUSR;
279 if (mode & VREAD)
280 mask |= S_IRUSR;
281 if (mode & VWRITE)
282 mask |= S_IWUSR;
283 return (file_mode & mask) == mask ? 0 : EACCES;
284 }
285
286 /* Otherwise, check the groups. */
287 for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
288 if (pmp->pm_gid == *gp) {
289 if (mode & VEXEC)
290 mask |= S_IXGRP;
291 if (mode & VREAD)
292 mask |= S_IRGRP;
293 if (mode & VWRITE)
294 mask |= S_IWGRP;
295 return (file_mode & mask) == mask ? 0 : EACCES;
296 }
297
298 /* Otherwise, check everyone else. */
299 if (mode & VEXEC)
300 mask |= S_IXOTH;
301 if (mode & VREAD)
302 mask |= S_IROTH;
303 if (mode & VWRITE)
304 mask |= S_IWOTH;
305 return (file_mode & mask) == mask ? 0 : EACCES;
306}
307
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308/*
309 * msdosfs_getattr(struct vnode *a_vp, struct vattr *a_vap,
310 * struct ucred *a_cred, struct thread *a_td)
311 */
984263bc 312static int
4625f023 313msdosfs_getattr(struct vop_getattr_args *ap)
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MD
314{
315 struct denode *dep = VTODE(ap->a_vp);
316 struct msdosfsmount *pmp = dep->de_pmp;
317 struct vattr *vap = ap->a_vap;
318 mode_t mode;
319 struct timespec ts;
320 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
321 u_long fileid;
322
323 getnanotime(&ts);
324 DETIMES(dep, &ts, &ts, &ts);
325 vap->va_fsid = dev2udev(dep->de_dev);
326 /*
327 * The following computation of the fileid must be the same as that
328 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
329 * doesn't work.
330 */
331 if (dep->de_Attributes & ATTR_DIRECTORY) {
332 fileid = cntobn(pmp, dep->de_StartCluster) * dirsperblk;
333 if (dep->de_StartCluster == MSDOSFSROOT)
334 fileid = 1;
335 } else {
336 fileid = cntobn(pmp, dep->de_dirclust) * dirsperblk;
337 if (dep->de_dirclust == MSDOSFSROOT)
338 fileid = roottobn(pmp, 0) * dirsperblk;
339 fileid += dep->de_diroffset / sizeof(struct direntry);
340 }
341 vap->va_fileid = fileid;
342 if ((dep->de_Attributes & ATTR_READONLY) == 0)
343 mode = S_IRWXU|S_IRWXG|S_IRWXO;
344 else
345 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
346 vap->va_mode = mode & pmp->pm_mask;
347 vap->va_uid = pmp->pm_uid;
348 vap->va_gid = pmp->pm_gid;
349 vap->va_nlink = 1;
350 vap->va_rdev = 0;
351 vap->va_size = dep->de_FileSize;
352 dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime);
353 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
354 dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime);
355 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, &vap->va_ctime);
356 } else {
357 vap->va_atime = vap->va_mtime;
358 vap->va_ctime = vap->va_mtime;
359 }
360 vap->va_flags = 0;
361 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0)
362 vap->va_flags |= SF_ARCHIVED;
363 vap->va_gen = 0;
364 vap->va_blocksize = pmp->pm_bpcluster;
365 vap->va_bytes =
366 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
367 vap->va_type = ap->a_vp->v_type;
368 vap->va_filerev = dep->de_modrev;
369 return (0);
370}
371
4625f023
CP
372/*
373 * msdosfs_setattr(struct vnode *a_vp, struct vattr *a_vap,
374 * struct ucred *a_cred, struct thread *a_td)
375 */
984263bc 376static int
4625f023 377msdosfs_setattr(struct vop_setattr_args *ap)
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MD
378{
379 struct vnode *vp = ap->a_vp;
380 struct denode *dep = VTODE(ap->a_vp);
381 struct msdosfsmount *pmp = dep->de_pmp;
382 struct vattr *vap = ap->a_vap;
383 struct ucred *cred = ap->a_cred;
384 int error = 0;
385
386#ifdef MSDOSFS_DEBUG
387 printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n",
dadab5e9 388 ap->a_vp, vap, cred, ap->a_td);
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389#endif
390
391 /*
392 * Check for unsettable attributes.
393 */
394 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
395 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
396 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
397 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
398#ifdef MSDOSFS_DEBUG
399 printf("msdosfs_setattr(): returning EINVAL\n");
400 printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n",
401 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid);
402 printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n",
403 vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen);
404 printf(" va_uid %x, va_gid %x\n",
405 vap->va_uid, vap->va_gid);
406#endif
407 return (EINVAL);
408 }
409 if (vap->va_flags != VNOVAL) {
410 if (vp->v_mount->mnt_flag & MNT_RDONLY)
411 return (EROFS);
412 if (cred->cr_uid != pmp->pm_uid &&
dadab5e9 413 (error = suser_cred(cred, PRISON_ROOT)))
984263bc
MD
414 return (error);
415 /*
416 * We are very inconsistent about handling unsupported
417 * attributes. We ignored the access time and the
418 * read and execute bits. We were strict for the other
419 * attributes.
420 *
421 * Here we are strict, stricter than ufs in not allowing
422 * users to attempt to set SF_SETTABLE bits or anyone to
423 * set unsupported bits. However, we ignore attempts to
424 * set ATTR_ARCHIVE for directories `cp -pr' from a more
425 * sensible file system attempts it a lot.
426 */
427 if (cred->cr_uid != 0) {
428 if (vap->va_flags & SF_SETTABLE)
429 return EPERM;
430 }
431 if (vap->va_flags & ~SF_ARCHIVED)
432 return EOPNOTSUPP;
433 if (vap->va_flags & SF_ARCHIVED)
434 dep->de_Attributes &= ~ATTR_ARCHIVE;
435 else if (!(dep->de_Attributes & ATTR_DIRECTORY))
436 dep->de_Attributes |= ATTR_ARCHIVE;
437 dep->de_flag |= DE_MODIFIED;
438 }
439
440 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
441 uid_t uid;
442 gid_t gid;
443
444 if (vp->v_mount->mnt_flag & MNT_RDONLY)
445 return (EROFS);
446 uid = vap->va_uid;
447 if (uid == (uid_t)VNOVAL)
448 uid = pmp->pm_uid;
449 gid = vap->va_gid;
450 if (gid == (gid_t)VNOVAL)
451 gid = pmp->pm_gid;
452 if ((cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid ||
453 (gid != pmp->pm_gid && !groupmember(gid, cred))) &&
dadab5e9 454 (error = suser_cred(cred, PRISON_ROOT)))
984263bc
MD
455 return error;
456 if (uid != pmp->pm_uid || gid != pmp->pm_gid)
457 return EINVAL;
458 }
459
460 if (vap->va_size != VNOVAL) {
461 /*
462 * Disallow write attempts on read-only file systems;
463 * unless the file is a socket, fifo, or a block or
464 * character device resident on the file system.
465 */
466 switch (vp->v_type) {
467 case VDIR:
468 return (EISDIR);
469 /* NOT REACHED */
470 case VLNK:
471 case VREG:
472 if (vp->v_mount->mnt_flag & MNT_RDONLY)
473 return (EROFS);
474 break;
475 default:
476 break;
477 }
3b568787 478 error = detrunc(dep, vap->va_size, 0, ap->a_td);
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MD
479 if (error)
480 return error;
481 }
482 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
483 if (vp->v_mount->mnt_flag & MNT_RDONLY)
484 return (EROFS);
485 if (cred->cr_uid != pmp->pm_uid &&
dadab5e9 486 (error = suser_cred(cred, PRISON_ROOT)) &&
984263bc 487 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
dadab5e9 488 (error = VOP_ACCESS(ap->a_vp, VWRITE, cred, ap->a_td))))
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MD
489 return (error);
490 if (vp->v_type != VDIR) {
491 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 &&
492 vap->va_atime.tv_sec != VNOVAL) {
493 dep->de_flag &= ~DE_ACCESS;
494 unix2dostime(&vap->va_atime, &dep->de_ADate,
495 NULL, NULL);
496 }
497 if (vap->va_mtime.tv_sec != VNOVAL) {
498 dep->de_flag &= ~DE_UPDATE;
499 unix2dostime(&vap->va_mtime, &dep->de_MDate,
500 &dep->de_MTime, NULL);
501 }
502 dep->de_Attributes |= ATTR_ARCHIVE;
503 dep->de_flag |= DE_MODIFIED;
504 }
505 }
506 /*
507 * DOS files only have the ability to have their writability
508 * attribute set, so we use the owner write bit to set the readonly
509 * attribute.
510 */
511 if (vap->va_mode != (mode_t)VNOVAL) {
512 if (vp->v_mount->mnt_flag & MNT_RDONLY)
513 return (EROFS);
514 if (cred->cr_uid != pmp->pm_uid &&
dadab5e9 515 (error = suser_cred(cred, PRISON_ROOT)))
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MD
516 return (error);
517 if (vp->v_type != VDIR) {
518 /* We ignore the read and execute bits. */
519 if (vap->va_mode & VWRITE)
520 dep->de_Attributes &= ~ATTR_READONLY;
521 else
522 dep->de_Attributes |= ATTR_READONLY;
523 dep->de_Attributes |= ATTR_ARCHIVE;
524 dep->de_flag |= DE_MODIFIED;
525 }
526 }
527 return (deupdat(dep, 1));
528}
529
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CP
530/*
531 * msdosfs_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
532 * struct ucred *a_cred)
533 */
984263bc 534static int
4625f023 535msdosfs_read(struct vop_read_args *ap)
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MD
536{
537 int error = 0;
538 int blsize;
539 int isadir;
540 int orig_resid;
541 u_int n;
542 u_long diff;
543 u_long on;
544 daddr_t lbn;
545 daddr_t rablock;
546 int rasize;
547 int seqcount;
548 struct buf *bp;
549 struct vnode *vp = ap->a_vp;
550 struct denode *dep = VTODE(vp);
551 struct msdosfsmount *pmp = dep->de_pmp;
552 struct uio *uio = ap->a_uio;
553
554 if (uio->uio_offset < 0)
555 return (EINVAL);
556
557 if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX)
558 return (0);
559 /*
560 * If they didn't ask for any data, then we are done.
561 */
562 orig_resid = uio->uio_resid;
563 if (orig_resid <= 0)
564 return (0);
565
566 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
567
568 isadir = dep->de_Attributes & ATTR_DIRECTORY;
569 do {
570 if (uio->uio_offset >= dep->de_FileSize)
571 break;
572 lbn = de_cluster(pmp, uio->uio_offset);
573 /*
574 * If we are operating on a directory file then be sure to
575 * do i/o with the vnode for the filesystem instead of the
576 * vnode for the directory.
577 */
578 if (isadir) {
579 /* convert cluster # to block # */
580 error = pcbmap(dep, lbn, &lbn, 0, &blsize);
581 if (error == E2BIG) {
582 error = EINVAL;
583 break;
584 } else if (error)
585 break;
3b568787 586 error = bread(pmp->pm_devvp, lbn, blsize, &bp);
984263bc
MD
587 } else {
588 blsize = pmp->pm_bpcluster;
589 rablock = lbn + 1;
590 if (seqcount > 1 &&
591 de_cn2off(pmp, rablock) < dep->de_FileSize) {
592 rasize = pmp->pm_bpcluster;
593 error = breadn(vp, lbn, blsize,
3b568787 594 &rablock, &rasize, 1, &bp);
984263bc 595 } else {
3b568787 596 error = bread(vp, lbn, blsize, &bp);
984263bc
MD
597 }
598 }
599 if (error) {
600 brelse(bp);
601 break;
602 }
603 on = uio->uio_offset & pmp->pm_crbomask;
604 diff = pmp->pm_bpcluster - on;
605 n = diff > uio->uio_resid ? uio->uio_resid : diff;
606 diff = dep->de_FileSize - uio->uio_offset;
607 if (diff < n)
608 n = diff;
609 diff = blsize - bp->b_resid;
610 if (diff < n)
611 n = diff;
612 error = uiomove(bp->b_data + on, (int) n, uio);
613 brelse(bp);
614 } while (error == 0 && uio->uio_resid > 0 && n != 0);
615 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) &&
616 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
617 dep->de_flag |= DE_ACCESS;
618 return (error);
619}
620
621/*
622 * Write data to a file or directory.
4625f023
CP
623 *
624 * msdosfs_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
625 * struct ucred *a_cred)
984263bc
MD
626 */
627static int
4625f023 628msdosfs_write(struct vop_write_args *ap)
984263bc
MD
629{
630 int n;
631 int croffset;
632 int resid;
633 u_long osize;
634 int error = 0;
635 u_long count;
636 daddr_t bn, lastcn;
637 struct buf *bp;
638 int ioflag = ap->a_ioflag;
639 struct uio *uio = ap->a_uio;
dadab5e9 640 struct thread *td = uio->uio_td;
984263bc
MD
641 struct vnode *vp = ap->a_vp;
642 struct vnode *thisvp;
643 struct denode *dep = VTODE(vp);
644 struct msdosfsmount *pmp = dep->de_pmp;
049d6e6d 645 struct proc *p = (td ? td->td_proc : NULL);
984263bc
MD
646
647#ifdef MSDOSFS_DEBUG
648 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
649 vp, uio, ioflag, cred);
650 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
651 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
652#endif
653
654 switch (vp->v_type) {
655 case VREG:
656 if (ioflag & IO_APPEND)
657 uio->uio_offset = dep->de_FileSize;
658 thisvp = vp;
659 break;
660 case VDIR:
661 return EISDIR;
662 default:
663 panic("msdosfs_write(): bad file type");
664 }
665
666 if (uio->uio_offset < 0)
667 return (EFBIG);
668
669 if (uio->uio_resid == 0)
670 return (0);
671
672 /*
673 * If they've exceeded their filesize limit, tell them about it.
674 */
675 if (p &&
676 ((uoff_t)uio->uio_offset + uio->uio_resid >
677 p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) {
678 psignal(p, SIGXFSZ);
679 return (EFBIG);
680 }
681
682 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX)
683 return (EFBIG);
684
685 /*
686 * If the offset we are starting the write at is beyond the end of
687 * the file, then they've done a seek. Unix filesystems allow
688 * files with holes in them, DOS doesn't so we must fill the hole
689 * with zeroed blocks.
690 */
691 if (uio->uio_offset > dep->de_FileSize) {
3b568787 692 error = deextend(dep, uio->uio_offset);
984263bc
MD
693 if (error)
694 return (error);
695 }
696
697 /*
698 * Remember some values in case the write fails.
699 */
700 resid = uio->uio_resid;
701 osize = dep->de_FileSize;
702
703 /*
704 * If we write beyond the end of the file, extend it to its ultimate
705 * size ahead of the time to hopefully get a contiguous area.
706 */
707 if (uio->uio_offset + resid > osize) {
708 count = de_clcount(pmp, uio->uio_offset + resid) -
709 de_clcount(pmp, osize);
710 error = extendfile(dep, count, NULL, NULL, 0);
711 if (error && (error != ENOSPC || (ioflag & IO_UNIT)))
712 goto errexit;
713 lastcn = dep->de_fc[FC_LASTFC].fc_frcn;
714 } else
715 lastcn = de_clcount(pmp, osize) - 1;
716
717 do {
718 if (de_cluster(pmp, uio->uio_offset) > lastcn) {
719 error = ENOSPC;
720 break;
721 }
722
723 croffset = uio->uio_offset & pmp->pm_crbomask;
724 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset);
725 if (uio->uio_offset + n > dep->de_FileSize) {
726 dep->de_FileSize = uio->uio_offset + n;
727 /* The object size needs to be set before buffer is allocated */
728 vnode_pager_setsize(vp, dep->de_FileSize);
729 }
730
731 bn = de_cluster(pmp, uio->uio_offset);
732 if ((uio->uio_offset & pmp->pm_crbomask) == 0
733 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid)
734 > de_cluster(pmp, uio->uio_offset)
735 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) {
736 /*
737 * If either the whole cluster gets written,
738 * or we write the cluster from its start beyond EOF,
739 * then no need to read data from disk.
740 */
741 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0);
742 clrbuf(bp);
743 /*
744 * Do the bmap now, since pcbmap needs buffers
745 * for the fat table. (see msdosfs_strategy)
746 */
747 if (bp->b_blkno == bp->b_lblkno) {
748 error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno,
749 0, 0);
750 if (error)
751 bp->b_blkno = -1;
752 }
753 if (bp->b_blkno == -1) {
754 brelse(bp);
755 if (!error)
756 error = EIO; /* XXX */
757 break;
758 }
759 } else {
760 /*
761 * The block we need to write into exists, so read it in.
762 */
3b568787 763 error = bread(thisvp, bn, pmp->pm_bpcluster, &bp);
984263bc
MD
764 if (error) {
765 brelse(bp);
766 break;
767 }
768 }
769
770 /*
771 * Should these vnode_pager_* functions be done on dir
772 * files?
773 */
774
775 /*
776 * Copy the data from user space into the buf header.
777 */
778 error = uiomove(bp->b_data + croffset, n, uio);
779 if (error) {
780 brelse(bp);
781 break;
782 }
783
784 /*
785 * If they want this synchronous then write it and wait for
786 * it. Otherwise, if on a cluster boundary write it
787 * asynchronously so we can move on to the next block
788 * without delay. Otherwise do a delayed write because we
789 * may want to write somemore into the block later.
790 */
791 if (ioflag & IO_SYNC)
792 (void) bwrite(bp);
793 else if (n + croffset == pmp->pm_bpcluster)
794 bawrite(bp);
795 else
796 bdwrite(bp);
797 dep->de_flag |= DE_UPDATE;
798 } while (error == 0 && uio->uio_resid > 0);
799
800 /*
801 * If the write failed and they want us to, truncate the file back
802 * to the size it was before the write was attempted.
803 */
804errexit:
805 if (error) {
806 if (ioflag & IO_UNIT) {
3b568787 807 detrunc(dep, osize, ioflag & IO_SYNC, NULL);
984263bc
MD
808 uio->uio_offset -= resid - uio->uio_resid;
809 uio->uio_resid = resid;
810 } else {
3b568787 811 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NULL);
984263bc
MD
812 if (uio->uio_resid != resid)
813 error = 0;
814 }
815 } else if (ioflag & IO_SYNC)
816 error = deupdat(dep, 1);
817 return (error);
818}
819
820/*
821 * Flush the blocks of a file to disk.
822 *
823 * This function is worthless for vnodes that represent directories. Maybe we
824 * could just do a sync if they try an fsync on a directory file.
4625f023
CP
825 *
826 * msdosfs_fsync(struct vnode *a_vp, struct ucred *a_cred, int a_waitfor,
827 * struct thread *a_td)
984263bc
MD
828 */
829static int
4625f023 830msdosfs_fsync(struct vop_fsync_args *ap)
984263bc
MD
831{
832 struct vnode *vp = ap->a_vp;
984263bc
MD
833
834 /*
835 * Flush all dirty buffers associated with a vnode.
836 */
6bae6177 837#ifdef DIAGNOSTIC
984263bc 838loop:
6bae6177
MD
839#endif
840 vfsync(vp, ap->a_waitfor, 0, (daddr_t)-1, NULL, NULL);
984263bc 841#ifdef DIAGNOSTIC
6bae6177 842 if (ap->a_waitfor == MNT_WAIT && !RB_EMPTY(&vp->v_rbdirty_tree)) {
984263bc
MD
843 vprint("msdosfs_fsync: dirty", vp);
844 goto loop;
845 }
846#endif
984263bc
MD
847 return (deupdat(VTODE(vp), ap->a_waitfor == MNT_WAIT));
848}
849
4625f023
CP
850/*
851 * msdosfs_remove(struct vnode *a_dvp, struct vnode *a_vp,
852 * struct componentname *a_cnp)
853 */
984263bc 854static int
4625f023 855msdosfs_remove(struct vop_remove_args *ap)
984263bc
MD
856{
857 struct denode *dep = VTODE(ap->a_vp);
858 struct denode *ddep = VTODE(ap->a_dvp);
859 int error;
860
861 if (ap->a_vp->v_type == VDIR)
862 error = EPERM;
863 else
864 error = removede(ddep, dep);
865#ifdef MSDOSFS_DEBUG
866 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount);
867#endif
868 return (error);
869}
870
871/*
872 * DOS filesystems don't know what links are. But since we already called
873 * msdosfs_lookup() with create and lockparent, the parent is locked so we
874 * have to free it before we return the error.
4625f023
CP
875 *
876 * msdosfs_link(struct vnode *a_tdvp, struct vnode *a_vp,
877 * struct componentname *a_cnp)
984263bc
MD
878 */
879static int
4625f023 880msdosfs_link(struct vop_link_args *ap)
984263bc
MD
881{
882 return (EOPNOTSUPP);
883}
884
885/*
886 * Renames on files require moving the denode to a new hash queue since the
887 * denode's location is used to compute which hash queue to put the file
888 * in. Unless it is a rename in place. For example "mv a b".
889 *
890 * What follows is the basic algorithm:
891 *
892 * if (file move) {
893 * if (dest file exists) {
894 * remove dest file
895 * }
896 * if (dest and src in same directory) {
897 * rewrite name in existing directory slot
898 * } else {
899 * write new entry in dest directory
900 * update offset and dirclust in denode
901 * move denode to new hash chain
902 * clear old directory entry
903 * }
904 * } else {
905 * directory move
906 * if (dest directory exists) {
907 * if (dest is not empty) {
908 * return ENOTEMPTY
909 * }
910 * remove dest directory
911 * }
912 * if (dest and src in same directory) {
913 * rewrite name in existing entry
914 * } else {
915 * be sure dest is not a child of src directory
916 * write entry in dest directory
917 * update "." and ".." in moved directory
918 * clear old directory entry for moved directory
919 * }
920 * }
921 *
922 * On entry:
923 * source's parent directory is unlocked
924 * source file or directory is unlocked
925 * destination's parent directory is locked
926 * destination file or directory is locked if it exists
927 *
928 * On exit:
929 * all denodes should be released
930 *
931 * Notes:
932 * I'm not sure how the memory containing the pathnames pointed at by the
933 * componentname structures is freed, there may be some memory bleeding
934 * for each rename done.
4625f023
CP
935 *
936 * msdosfs_rename(struct vnode *a_fdvp, struct vnode *a_fvp,
937 * struct componentname *a_fcnp, struct vnode *a_tdvp,
938 * struct vnode *a_tvp, struct componentname *a_tcnp)
984263bc
MD
939 */
940static int
4625f023 941msdosfs_rename(struct vop_rename_args *ap)
984263bc
MD
942{
943 struct vnode *tdvp = ap->a_tdvp;
944 struct vnode *fvp = ap->a_fvp;
945 struct vnode *fdvp = ap->a_fdvp;
946 struct vnode *tvp = ap->a_tvp;
947 struct componentname *tcnp = ap->a_tcnp;
948 struct componentname *fcnp = ap->a_fcnp;
dadab5e9 949 struct thread *td = fcnp->cn_td;
984263bc
MD
950 struct denode *ip, *xp, *dp, *zp;
951 u_char toname[11], oldname[11];
952 u_long from_diroffset, to_diroffset;
953 u_char to_count;
954 int doingdirectory = 0, newparent = 0;
955 int error;
956 u_long cn;
957 daddr_t bn;
958 struct denode *fddep; /* from file's parent directory */
959 struct msdosfsmount *pmp;
960 struct direntry *dotdotp;
961 struct buf *bp;
962
963 fddep = VTODE(ap->a_fdvp);
964 pmp = fddep->de_pmp;
965
966 pmp = VFSTOMSDOSFS(fdvp->v_mount);
967
984263bc
MD
968 /*
969 * Check for cross-device rename.
970 */
971 if ((fvp->v_mount != tdvp->v_mount) ||
972 (tvp && (fvp->v_mount != tvp->v_mount))) {
973 error = EXDEV;
974abortit:
975 if (tdvp == tvp)
976 vrele(tdvp);
977 else
978 vput(tdvp);
979 if (tvp)
980 vput(tvp);
981 vrele(fdvp);
982 vrele(fvp);
983 return (error);
984 }
985
986 /*
987 * If source and dest are the same, do nothing.
988 */
989 if (tvp == fvp) {
990 error = 0;
991 goto abortit;
992 }
993
fad57d0e
MD
994 /*
995 * fvp, fdvp are unlocked, tvp, tdvp are locked. Lock fvp and note
996 * that we have to unlock it to use the abortit target.
997 */
5fd012e0 998 error = vn_lock(fvp, LK_EXCLUSIVE, td);
984263bc
MD
999 if (error)
1000 goto abortit;
1001 dp = VTODE(fdvp);
1002 ip = VTODE(fvp);
1003
1004 /*
1005 * Be sure we are not renaming ".", "..", or an alias of ".". This
1006 * leads to a crippled directory tree. It's pretty tough to do a
1007 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
1008 * doesn't work if the ".." entry is missing.
1009 */
1010 if (ip->de_Attributes & ATTR_DIRECTORY) {
1011 /*
1012 * Avoid ".", "..", and aliases of "." for obvious reasons.
1013 */
1014 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
1015 dp == ip ||
2b69e610
MD
1016 (fcnp->cn_flags & CNP_ISDOTDOT) ||
1017 (tcnp->cn_flags & CNP_ISDOTDOT) ||
984263bc 1018 (ip->de_flag & DE_RENAME)) {
5fd012e0 1019 VOP_UNLOCK(fvp, 0, td);
984263bc
MD
1020 error = EINVAL;
1021 goto abortit;
1022 }
1023 ip->de_flag |= DE_RENAME;
1024 doingdirectory++;
1025 }
1026
1027 /*
fad57d0e
MD
1028 * fvp locked, fdvp unlocked, tvp, tdvp locked. DE_RENAME only
1029 * set if doingdirectory. We will get fvp unlocked in fairly
1030 * short order. dp and xp must be setup and fvp must be unlocked
1031 * for the out and bad targets to work properly.
984263bc
MD
1032 */
1033 dp = VTODE(tdvp);
1034 xp = tvp ? VTODE(tvp) : NULL;
fad57d0e 1035
984263bc
MD
1036 /*
1037 * Remember direntry place to use for destination
1038 */
1039 to_diroffset = dp->de_fndoffset;
1040 to_count = dp->de_fndcnt;
1041
1042 /*
1043 * If ".." must be changed (ie the directory gets a new
1044 * parent) then the source directory must not be in the
1045 * directory heirarchy above the target, as this would
1046 * orphan everything below the source directory. Also
1047 * the user must have write permission in the source so
1048 * as to be able to change "..". We must repeat the call
1049 * to namei, as the parent directory is unlocked by the
1050 * call to doscheckpath().
1051 */
dadab5e9 1052 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_td);
5fd012e0 1053 VOP_UNLOCK(fvp, 0, td);
984263bc
MD
1054 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
1055 newparent = 1;
fad57d0e
MD
1056
1057 /*
1058 * ok. fvp, fdvp unlocked, tvp, tdvp locked. tvp may be NULL.
1059 * DE_RENAME only set if doingdirectory.
1060 */
984263bc
MD
1061 if (doingdirectory && newparent) {
1062 if (error) /* write access check above */
1063 goto bad;
fad57d0e 1064 if (xp != NULL) {
984263bc 1065 vput(tvp);
fad57d0e
MD
1066 xp = NULL;
1067 }
984263bc 1068 /*
fad57d0e
MD
1069 * checkpath vput's tdvp (VTOI(dp)) on return no matter what,
1070 * get an extra ref so we wind up with just an unlocked, ref'd
1071 * tdvp. The 'out' target skips tvp and tdvp cleanups (tdvp
1072 * isn't locked so we can't use the out target).
984263bc 1073 */
fad57d0e 1074 vref(tdvp);
984263bc 1075 error = doscheckpath(ip, dp);
6970b52a 1076 tcnp->cn_flags |= CNP_PDIRUNLOCK;
fad57d0e
MD
1077 if (error) {
1078 vrele(tdvp);
984263bc 1079 goto out;
fad57d0e
MD
1080 }
1081 /*
1082 * relookup no longer messes with the ref count. tdvp must
1083 * be unlocked on entry and on success will be locked on
1084 * return.
1085 */
984263bc 1086 error = relookup(tdvp, &tvp, tcnp);
fad57d0e
MD
1087 if (error) {
1088 if (tcnp->cn_flags & CNP_PDIRUNLOCK)
1089 vrele(tdvp);
1090 else
1091 vput(tdvp);
984263bc 1092 goto out;
fad57d0e
MD
1093 }
1094
1095 /*
1096 * tvp and tdvp are now locked again.
1097 */
984263bc
MD
1098 dp = VTODE(tdvp);
1099 xp = tvp ? VTODE(tvp) : NULL;
1100 }
1101
fad57d0e
MD
1102 /*
1103 * tvp and tdvp are now locked again, the 'bad' target can be used
1104 * to clean them up again. Delete an existant target and clean
1105 * up tvp. Set xp to NULL to indicate that tvp has been cleaned up.
1106 */
984263bc
MD
1107 if (xp != NULL) {
1108 /*
1109 * Target must be empty if a directory and have no links
1110 * to it. Also, ensure source and target are compatible
1111 * (both directories, or both not directories).
1112 */
1113 if (xp->de_Attributes & ATTR_DIRECTORY) {
1114 if (!dosdirempty(xp)) {
1115 error = ENOTEMPTY;
1116 goto bad;
1117 }
1118 if (!doingdirectory) {
1119 error = ENOTDIR;
1120 goto bad;
1121 }
984263bc
MD
1122 } else if (doingdirectory) {
1123 error = EISDIR;
1124 goto bad;
1125 }
1126 error = removede(dp, xp);
1127 if (error)
1128 goto bad;
1129 vput(tvp);
1130 xp = NULL;
fad57d0e 1131 tvp = NULL;
984263bc
MD
1132 }
1133
1134 /*
1135 * Convert the filename in tcnp into a dos filename. We copy this
1136 * into the denode and directory entry for the destination
1137 * file/directory.
1138 */
1139 error = uniqdosname(VTODE(tdvp), tcnp, toname);
1140 if (error)
fad57d0e 1141 goto bad;
984263bc
MD
1142
1143 /*
fad57d0e
MD
1144 * Since from wasn't locked at various places above, we have to do
1145 * a relookup here. If the target and source are the same directory
1146 * we have to unlock the target directory in order to safely relookup
1147 * the source, because relookup expects its directory to be unlocked.
1148 *
1149 * Note that ap->a_fvp is still valid and ref'd. Any cleanup must
1150 * now take that into account.
1151 *
1152 * The tdvp locking issues make this a real mess.
984263bc 1153 */
2b69e610 1154 fcnp->cn_flags &= ~CNP_MODMASK;
fad57d0e
MD
1155 fcnp->cn_flags |= CNP_LOCKPARENT;
1156 if (newparent == 0)
5fd012e0 1157 VOP_UNLOCK(tdvp, 0, td);
fad57d0e
MD
1158 error = relookup(fdvp, &fvp, fcnp);
1159 if (error || fvp == NULL) {
984263bc 1160 /*
fad57d0e
MD
1161 * From name has disappeared. Note: fdvp might == tdvp.
1162 *
1163 * DE_RENAME is only set if doingdirectory.
984263bc
MD
1164 */
1165 if (doingdirectory)
1166 panic("rename: lost dir entry");
fad57d0e
MD
1167 if (fcnp->cn_flags & CNP_PDIRUNLOCK)
1168 vrele(fdvp);
1169 else
1170 vput(fdvp);
1171 if (newparent == 0)
1172 vrele(tdvp);
1173 else
1174 vput(tdvp);
984263bc 1175 vrele(ap->a_fvp);
fad57d0e 1176 return(0);
984263bc 1177 }
fad57d0e
MD
1178
1179 /*
1180 * No error occured. tdvp, fdvp and fvp are all locked. If
1181 * newparent was 0 be aware that fdvp == tdvp. tvp has been cleaned
1182 * up. ap->a_fvp is still refd.
1183 */
984263bc
MD
1184 xp = VTODE(fvp);
1185 zp = VTODE(fdvp);
1186 from_diroffset = zp->de_fndoffset;
1187
1188 /*
1189 * Ensure that the directory entry still exists and has not
1190 * changed till now. If the source is a file the entry may
1191 * have been unlinked or renamed. In either case there is
1192 * no further work to be done. If the source is a directory
1193 * then it cannot have been rmdir'ed or renamed; this is
1194 * prohibited by the DE_RENAME flag.
fad57d0e
MD
1195 *
1196 * DE_RENAME is only set if doingdirectory.
984263bc
MD
1197 */
1198 if (xp != ip) {
1199 if (doingdirectory)
1200 panic("rename: lost dir entry");
fad57d0e 1201 goto done;
984263bc 1202 } else {
3446c007
MD
1203 u_long new_dirclust;
1204 u_long new_diroffset;
1205
984263bc
MD
1206 /*
1207 * First write a new entry in the destination
1208 * directory and mark the entry in the source directory
1209 * as deleted. Then move the denode to the correct hash
1210 * chain for its new location in the filesystem. And, if
1211 * we moved a directory, then update its .. entry to point
1212 * to the new parent directory.
1213 */
1214 bcopy(ip->de_Name, oldname, 11);
1215 bcopy(toname, ip->de_Name, 11); /* update denode */
1216 dp->de_fndoffset = to_diroffset;
1217 dp->de_fndcnt = to_count;
1218 error = createde(ip, dp, (struct denode **)0, tcnp);
1219 if (error) {
1220 bcopy(oldname, ip->de_Name, 11);
fad57d0e 1221 goto done;
984263bc
MD
1222 }
1223 ip->de_refcnt++;
1224 zp->de_fndoffset = from_diroffset;
1225 error = removede(zp, ip);
1226 if (error) {
1227 /* XXX should really panic here, fs is corrupt */
fad57d0e 1228 goto done;
984263bc
MD
1229 }
1230 if (!doingdirectory) {
1231 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0,
3446c007 1232 &new_dirclust, 0);
984263bc
MD
1233 if (error) {
1234 /* XXX should really panic here, fs is corrupt */
fad57d0e 1235 goto done;
984263bc 1236 }
3446c007
MD
1237 if (new_dirclust == MSDOSFSROOT)
1238 new_diroffset = to_diroffset;
984263bc 1239 else
3446c007
MD
1240 new_diroffset = to_diroffset & pmp->pm_crbomask;
1241 msdosfs_reinsert(ip, new_dirclust, new_diroffset);
984263bc 1242 }
984263bc
MD
1243 }
1244
1245 /*
1246 * If we moved a directory to a new parent directory, then we must
1247 * fixup the ".." entry in the moved directory.
1248 */
1249 if (doingdirectory && newparent) {
1250 cn = ip->de_StartCluster;
1251 if (cn == MSDOSFSROOT) {
1252 /* this should never happen */
1253 panic("msdosfs_rename(): updating .. in root directory?");
fad57d0e 1254 } else {
984263bc 1255 bn = cntobn(pmp, cn);
fad57d0e 1256 }
3b568787 1257 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, &bp);
984263bc
MD
1258 if (error) {
1259 /* XXX should really panic here, fs is corrupt */
1260 brelse(bp);
fad57d0e 1261 goto done;
984263bc
MD
1262 }
1263 dotdotp = (struct direntry *)bp->b_data + 1;
1264 putushort(dotdotp->deStartCluster, dp->de_StartCluster);
1265 if (FAT32(pmp))
1266 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16);
1267 error = bwrite(bp);
1268 if (error) {
1269 /* XXX should really panic here, fs is corrupt */
fad57d0e 1270 goto done;
984263bc
MD
1271 }
1272 }
1273
fad57d0e
MD
1274 /*
1275 * done case fvp, fdvp, tdvp are locked. ap->a_fvp is refd
1276 */
1277done:
1278 if (doingdirectory)
1279 ip->de_flag &= ~DE_RENAME; /* XXX fvp not locked */
1280 vput(fvp);
1281 if (newparent)
1282 vput(fdvp);
1283 else
1284 vrele(fdvp);
1285 vput(tdvp);
1286 vrele(ap->a_fvp);
1287 return (error);
1288
1289 /*
1290 * 'bad' target: xp governs tvp. tvp and tdvp arel ocked, fdvp and fvp
1291 * are not locked. ip points to fvp's inode which may have DE_RENAME
1292 * set.
1293 */
984263bc
MD
1294bad:
1295 if (xp)
1296 vput(tvp);
1297 vput(tdvp);
1298out:
fad57d0e
MD
1299 /*
1300 * 'out' target: tvp and tdvp have already been cleaned up.
1301 */
1302 if (doingdirectory)
1303 ip->de_flag &= ~DE_RENAME;
984263bc
MD
1304 vrele(fdvp);
1305 vrele(fvp);
1306 return (error);
1307
1308}
1309
1310static struct {
1311 struct direntry dot;
1312 struct direntry dotdot;
1313} dosdirtemplate = {
1314 { ". ", " ", /* the . entry */
1315 ATTR_DIRECTORY, /* file attribute */
1316 0, /* reserved */
1317 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1318 { 0, 0 }, /* access date */
1319 { 0, 0 }, /* high bits of start cluster */
1320 { 210, 4 }, { 210, 4 }, /* modify time & date */
1321 { 0, 0 }, /* startcluster */
1322 { 0, 0, 0, 0 } /* filesize */
1323 },
1324 { ".. ", " ", /* the .. entry */
1325 ATTR_DIRECTORY, /* file attribute */
1326 0, /* reserved */
1327 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1328 { 0, 0 }, /* access date */
1329 { 0, 0 }, /* high bits of start cluster */
1330 { 210, 4 }, { 210, 4 }, /* modify time & date */
1331 { 0, 0 }, /* startcluster */
1332 { 0, 0, 0, 0 } /* filesize */
1333 }
1334};
1335
4625f023
CP
1336/*
1337 * msdosfs_mkdir(struct vnode *a_dvp, struct vnode **a_vpp,
1338 * struct componentname *a_cnp, struct vattr *a_vap)
1339 */
984263bc 1340static int
4625f023 1341msdosfs_mkdir(struct vop_mkdir_args *ap)
984263bc
MD
1342{
1343 struct componentname *cnp = ap->a_cnp;
1344 struct denode *dep;
1345 struct denode *pdep = VTODE(ap->a_dvp);
1346 struct direntry *denp;
1347 struct msdosfsmount *pmp = pdep->de_pmp;
1348 struct buf *bp;
1349 u_long newcluster, pcl;
1350 int bn;
1351 int error;
1352 struct denode ndirent;
1353 struct timespec ts;
1354
1355 /*
1356 * If this is the root directory and there is no space left we
1357 * can't do anything. This is because the root directory can not
1358 * change size.
1359 */
1360 if (pdep->de_StartCluster == MSDOSFSROOT
1361 && pdep->de_fndoffset >= pdep->de_FileSize) {
1362 error = ENOSPC;
1363 goto bad2;
1364 }
1365
1366 /*
1367 * Allocate a cluster to hold the about to be created directory.
1368 */
1369 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL);
1370 if (error)
1371 goto bad2;
1372
1373 bzero(&ndirent, sizeof(ndirent));
1374 ndirent.de_pmp = pmp;
1375 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1376 getnanotime(&ts);
1377 DETIMES(&ndirent, &ts, &ts, &ts);
1378
1379 /*
1380 * Now fill the cluster with the "." and ".." entries. And write
1381 * the cluster to disk. This way it is there for the parent
1382 * directory to be pointing at if there were a crash.
1383 */
1384 bn = cntobn(pmp, newcluster);
1385 /* always succeeds */
1386 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0);
1387 bzero(bp->b_data, pmp->pm_bpcluster);
1388 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate);
1389 denp = (struct direntry *)bp->b_data;
1390 putushort(denp[0].deStartCluster, newcluster);
1391 putushort(denp[0].deCDate, ndirent.de_CDate);
1392 putushort(denp[0].deCTime, ndirent.de_CTime);
1393 denp[0].deCHundredth = ndirent.de_CHun;
1394 putushort(denp[0].deADate, ndirent.de_ADate);
1395 putushort(denp[0].deMDate, ndirent.de_MDate);
1396 putushort(denp[0].deMTime, ndirent.de_MTime);
1397 pcl = pdep->de_StartCluster;
1398 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1399 pcl = 0;
1400 putushort(denp[1].deStartCluster, pcl);
1401 putushort(denp[1].deCDate, ndirent.de_CDate);
1402 putushort(denp[1].deCTime, ndirent.de_CTime);
1403 denp[1].deCHundredth = ndirent.de_CHun;
1404 putushort(denp[1].deADate, ndirent.de_ADate);
1405 putushort(denp[1].deMDate, ndirent.de_MDate);
1406 putushort(denp[1].deMTime, ndirent.de_MTime);
1407 if (FAT32(pmp)) {
1408 putushort(denp[0].deHighClust, newcluster >> 16);
1409 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16);
1410 }
1411
1412 error = bwrite(bp);
1413 if (error)
1414 goto bad;
1415
1416 /*
1417 * Now build up a directory entry pointing to the newly allocated
1418 * cluster. This will be written to an empty slot in the parent
1419 * directory.
1420 */
984263bc
MD
1421 error = uniqdosname(pdep, cnp, ndirent.de_Name);
1422 if (error)
1423 goto bad;
1424
1425 ndirent.de_Attributes = ATTR_DIRECTORY;
1426 ndirent.de_LowerCase = 0;
1427 ndirent.de_StartCluster = newcluster;
1428 ndirent.de_FileSize = 0;
1429 ndirent.de_dev = pdep->de_dev;
1430 ndirent.de_devvp = pdep->de_devvp;
1431 error = createde(&ndirent, pdep, &dep, cnp);
1432 if (error)
1433 goto bad;
1434 *ap->a_vpp = DETOV(dep);
1435 return (0);
1436
1437bad:
1438 clusterfree(pmp, newcluster, NULL);
1439bad2:
1440 return (error);
1441}
1442
4625f023
CP
1443/*
1444 * msdosfs_rmdir(struct vnode *a_dvp, struct vnode *a_vp,
1445 * struct componentname *a_cnp)
1446 */
984263bc 1447static int
4625f023 1448msdosfs_rmdir(struct vop_rmdir_args *ap)
984263bc 1449{
dadab5e9
MD
1450 struct vnode *vp = ap->a_vp;
1451 struct vnode *dvp = ap->a_dvp;
1452 struct componentname *cnp = ap->a_cnp;
1453 struct denode *ip, *dp;
1454 struct thread *td = cnp->cn_td;
984263bc
MD
1455 int error;
1456
1457 ip = VTODE(vp);
1458 dp = VTODE(dvp);
1459
1460 /*
1461 * Verify the directory is empty (and valid).
1462 * (Rmdir ".." won't be valid since
1463 * ".." will contain a reference to
1464 * the current directory and thus be
1465 * non-empty.)
1466 */
1467 error = 0;
1468 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) {
1469 error = ENOTEMPTY;
1470 goto out;
1471 }
1472 /*
1473 * Delete the entry from the directory. For dos filesystems this
1474 * gets rid of the directory entry on disk, the in memory copy
1475 * still exists but the de_refcnt is <= 0. This prevents it from
1476 * being found by deget(). When the vput() on dep is done we give
1477 * up access and eventually msdosfs_reclaim() will be called which
1478 * will remove it from the denode cache.
1479 */
1480 error = removede(dp, ip);
1481 if (error)
1482 goto out;
1483 /*
1484 * This is where we decrement the link count in the parent
1485 * directory. Since dos filesystems don't do this we just purge
1486 * the name cache.
1487 */
5fd012e0 1488 VOP_UNLOCK(dvp, 0, td);
984263bc
MD
1489 /*
1490 * Truncate the directory that is being deleted.
1491 */
3b568787 1492 error = detrunc(ip, (u_long)0, IO_SYNC, td);
984263bc 1493
5fd012e0 1494 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
984263bc
MD
1495out:
1496 return (error);
1497}
1498
1499/*
1500 * DOS filesystems don't know what symlinks are.
4625f023
CP
1501 *
1502 * msdosfs_symlink(struct vnode *a_dvp, struct vnode **a_vpp,
1503 * struct componentname *a_cnp, struct vattr *a_vap,
1504 * char *a_target)
984263bc
MD
1505 */
1506static int
4625f023 1507msdosfs_symlink(struct vop_symlink_args *ap)
984263bc
MD
1508{
1509 return (EOPNOTSUPP);
1510}
1511
4625f023
CP
1512/*
1513 * msdosfs_readdir(struct vnode *a_vp, struct uio *a_uio,
1514 * struct ucred *a_cred, int *a_eofflag, int *a_ncookies,
1515 * u_long **a_cookies)
1516 */
984263bc 1517static int
4625f023 1518msdosfs_readdir(struct vop_readdir_args *ap)
984263bc
MD
1519{
1520 int error = 0;
1521 int diff;
1522 long n;
1523 int blsize;
1524 long on;
1525 u_long cn;
1526 u_long fileno;
1527 u_long dirsperblk;
1528 long bias = 0;
1529 daddr_t bn, lbn;
1530 struct buf *bp;
1531 struct denode *dep = VTODE(ap->a_vp);
1532 struct msdosfsmount *pmp = dep->de_pmp;
1533 struct direntry *dentp;
1534 struct dirent dirbuf;
1535 struct uio *uio = ap->a_uio;
1536 u_long *cookies = NULL;
1537 int ncookies = 0;
1538 off_t offset, off;
1539 int chksum = -1;
1540
1541#ifdef MSDOSFS_DEBUG
1542 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
1543 ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
1544#endif
1545
1546 /*
1547 * msdosfs_readdir() won't operate properly on regular files since
1548 * it does i/o only with the the filesystem vnode, and hence can
1549 * retrieve the wrong block from the buffer cache for a plain file.
1550 * So, fail attempts to readdir() on a plain file.
1551 */
1552 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
1553 return (ENOTDIR);
1554
1555 /*
1556 * To be safe, initialize dirbuf
1557 */
1558 bzero(dirbuf.d_name, sizeof(dirbuf.d_name));
1559
1560 /*
1561 * If the user buffer is smaller than the size of one dos directory
1562 * entry or the file offset is not a multiple of the size of a
1563 * directory entry, then we fail the read.
1564 */
1565 off = offset = uio->uio_offset;
1566 if (uio->uio_resid < sizeof(struct direntry) ||
1567 (offset & (sizeof(struct direntry) - 1)))
1568 return (EINVAL);
1569
1570 if (ap->a_ncookies) {
1571 ncookies = uio->uio_resid / 16;
1572 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP,
1573 M_WAITOK);
1574 *ap->a_cookies = cookies;
1575 *ap->a_ncookies = ncookies;
1576 }
1577
1578 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1579
1580 /*
1581 * If they are reading from the root directory then, we simulate
1582 * the . and .. entries since these don't exist in the root
1583 * directory. We also set the offset bias to make up for having to
1584 * simulate these entries. By this I mean that at file offset 64 we
1585 * read the first entry in the root directory that lives on disk.
1586 */
1587 if (dep->de_StartCluster == MSDOSFSROOT
1588 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
1589#if 0
1590 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n",
1591 offset);
1592#endif
1593 bias = 2 * sizeof(struct direntry);
1594 if (offset < bias) {
1595 for (n = (int)offset / sizeof(struct direntry);
1596 n < 2; n++) {
1597 if (FAT32(pmp))
1598 dirbuf.d_fileno = cntobn(pmp,
1599 pmp->pm_rootdirblk)
1600 * dirsperblk;
1601 else
1602 dirbuf.d_fileno = 1;
1603 dirbuf.d_type = DT_DIR;
1604 switch (n) {
1605 case 0:
1606 dirbuf.d_namlen = 1;
1607 strcpy(dirbuf.d_name, ".");
1608 break;
1609 case 1:
1610 dirbuf.d_namlen = 2;
1611 strcpy(dirbuf.d_name, "..");
1612 break;
1613 }
1614 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1615 if (uio->uio_resid < dirbuf.d_reclen)
1616 goto out;
1617 error = uiomove((caddr_t) &dirbuf,
1618 dirbuf.d_reclen, uio);
1619 if (error)
1620 goto out;
1621 offset += sizeof(struct direntry);
1622 off = offset;
1623 if (cookies) {
1624 *cookies++ = offset;
1625 if (--ncookies <= 0)
1626 goto out;
1627 }
1628 }
1629 }
1630 }
1631
1632 off = offset;
1633 while (uio->uio_resid > 0) {
1634 lbn = de_cluster(pmp, offset - bias);
1635 on = (offset - bias) & pmp->pm_crbomask;
1636 n = min(pmp->pm_bpcluster - on, uio->uio_resid);
1637 diff = dep->de_FileSize - (offset - bias);
1638 if (diff <= 0)
1639 break;
1640 n = min(n, diff);
1641 error = pcbmap(dep, lbn, &bn, &cn, &blsize);
1642 if (error)
1643 break;
3b568787 1644 error = bread(pmp->pm_devvp, bn, blsize, &bp);
984263bc
MD
1645 if (error) {
1646 brelse(bp);
1647 return (error);
1648 }
1649 n = min(n, blsize - bp->b_resid);
1650
1651 /*
1652 * Convert from dos directory entries to fs-independent
1653 * directory entries.
1654 */
1655 for (dentp = (struct direntry *)(bp->b_data + on);
1656 (char *)dentp < bp->b_data + on + n;
1657 dentp++, offset += sizeof(struct direntry)) {
1658#if 0
1659 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
1660 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
1661#endif
1662 /*
1663 * If this is an unused entry, we can stop.
1664 */
1665 if (dentp->deName[0] == SLOT_EMPTY) {
1666 brelse(bp);
1667 goto out;
1668 }
1669 /*
1670 * Skip deleted entries.
1671 */
1672 if (dentp->deName[0] == SLOT_DELETED) {
1673 chksum = -1;
1674 continue;
1675 }
1676
1677 /*
1678 * Handle Win95 long directory entries
1679 */
1680 if (dentp->deAttributes == ATTR_WIN95) {
1681 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
1682 continue;
1683 chksum = win2unixfn((struct winentry *)dentp,
1684 &dirbuf, chksum,
1685 pmp->pm_flags & MSDOSFSMNT_U2WTABLE,
1686 pmp->pm_u2w);
1687 continue;
1688 }
1689
1690 /*
1691 * Skip volume labels
1692 */
1693 if (dentp->deAttributes & ATTR_VOLUME) {
1694 chksum = -1;
1695 continue;
1696 }
1697 /*
1698 * This computation of d_fileno must match
1699 * the computation of va_fileid in
1700 * msdosfs_getattr.
1701 */
1702 if (dentp->deAttributes & ATTR_DIRECTORY) {
1703 fileno = getushort(dentp->deStartCluster);
1704 if (FAT32(pmp))
1705 fileno |= getushort(dentp->deHighClust) << 16;
1706 /* if this is the root directory */
1707 if (fileno == MSDOSFSROOT)
1708 if (FAT32(pmp))
1709 fileno = cntobn(pmp,
1710 pmp->pm_rootdirblk)
1711 * dirsperblk;
1712 else
1713 fileno = 1;
1714 else
1715 fileno = cntobn(pmp, fileno) * dirsperblk;
1716 dirbuf.d_fileno = fileno;
1717 dirbuf.d_type = DT_DIR;
1718 } else {
1719 dirbuf.d_fileno = offset / sizeof(struct direntry);
1720 dirbuf.d_type = DT_REG;
1721 }
1722 if (chksum != winChksum(dentp->deName))
1723 dirbuf.d_namlen = dos2unixfn(dentp->deName,
1724 (u_char *)dirbuf.d_name,
1725 dentp->deLowerCase |
1726 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ?
1727 (LCASE_BASE | LCASE_EXT) : 0),
1728 pmp->pm_flags & MSDOSFSMNT_U2WTABLE,
1729 pmp->pm_d2u,
1730 pmp->pm_flags & MSDOSFSMNT_ULTABLE,
1731 pmp->pm_ul);
1732 else
1733 dirbuf.d_name[dirbuf.d_namlen] = 0;
1734 chksum = -1;
1735 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf);
1736 if (uio->uio_resid < dirbuf.d_reclen) {
1737 brelse(bp);
1738 goto out;
1739 }
1740 error = uiomove((caddr_t) &dirbuf,
1741 dirbuf.d_reclen, uio);
1742 if (error) {
1743 brelse(bp);
1744 goto out;
1745 }
1746 if (cookies) {
1747 *cookies++ = offset + sizeof(struct direntry);
1748 if (--ncookies <= 0) {
1749 brelse(bp);
1750 goto out;
1751 }
1752 }
1753 off = offset + sizeof(struct direntry);
1754 }
1755 brelse(bp);
1756 }
1757out:
1758 /* Subtract unused cookies */
1759 if (ap->a_ncookies)
1760 *ap->a_ncookies -= ncookies;
1761
1762 uio->uio_offset = off;
1763
1764 /*
1765 * Set the eofflag (NFS uses it)
1766 */
1767 if (ap->a_eofflag) {
1768 if (dep->de_FileSize - (offset - bias) <= 0)
1769 *ap->a_eofflag = 1;
1770 else
1771 *ap->a_eofflag = 0;
1772 }
1773 return (error);
1774}
1775
1776/*
1777 * vp - address of vnode file the file
1778 * bn - which cluster we are interested in mapping to a filesystem block number.
1779 * vpp - returns the vnode for the block special file holding the filesystem
1780 * containing the file of interest
1781 * bnp - address of where to return the filesystem relative block number
4625f023
CP
1782 *
1783 * msdosfs_bmap(struct vnode *a_vp, daddr_t a_bn, struct vnode **a_vpp,
1784 * daddr_t *a_bnp, int *a_runp, int *a_runb)
984263bc
MD
1785 */
1786static int
4625f023 1787msdosfs_bmap(struct vop_bmap_args *ap)
984263bc
MD
1788{
1789 struct denode *dep = VTODE(ap->a_vp);
1790
1791 if (ap->a_vpp != NULL)
1792 *ap->a_vpp = dep->de_devvp;
1793 if (ap->a_bnp == NULL)
1794 return (0);
1795 if (ap->a_runp) {
1796 /*
1797 * Sequential clusters should be counted here.
1798 */
1799 *ap->a_runp = 0;
1800 }
1801 if (ap->a_runb) {
1802 *ap->a_runb = 0;
1803 }
1804 return (pcbmap(dep, ap->a_bn, ap->a_bnp, 0, 0));
1805}
1806
4625f023
CP
1807/*
1808 * msdosfs_strategy(struct vnode *a_vp, struct buf *a_bp)
1809 */
984263bc 1810static int
4625f023 1811msdosfs_strategy(struct vop_strategy_args *ap)
984263bc
MD
1812{
1813 struct buf *bp = ap->a_bp;
1814 struct denode *dep = VTODE(bp->b_vp);
1815 struct vnode *vp;
1816 int error = 0;
1817
1818 if (bp->b_vp->v_type == VBLK || bp->b_vp->v_type == VCHR)
1819 panic("msdosfs_strategy: spec");
1820 /*
1821 * If we don't already know the filesystem relative block number
1822 * then get it using pcbmap(). If pcbmap() returns the block
1823 * number as -1 then we've got a hole in the file. DOS filesystems
1824 * don't allow files with holes, so we shouldn't ever see this.
1825 */
1826 if (bp->b_blkno == bp->b_lblkno) {
1827 error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno, 0, 0);
1828 if (error) {
1829 bp->b_error = error;
1830 bp->b_flags |= B_ERROR;
1831 biodone(bp);
1832 return (error);
1833 }
1834 if ((long)bp->b_blkno == -1)
1835 vfs_bio_clrbuf(bp);
1836 }
1837 if (bp->b_blkno == -1) {
1838 biodone(bp);
1839 return (0);
1840 }
1841 /*
1842 * Read/write the block from/to the disk that contains the desired
1843 * file block.
1844 */
1845 vp = dep->de_devvp;
1846 bp->b_dev = vp->v_rdev;
1847 VOP_STRATEGY(vp, bp);
1848 return (0);
1849}
1850
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CP
1851/*
1852 * msdosfs_print(struct vnode *vp)
1853 */
984263bc 1854static int
4625f023 1855msdosfs_print(struct vop_print_args *ap)
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1856{
1857 struct denode *dep = VTODE(ap->a_vp);
1858
1859 printf(
1860 "tag VT_MSDOSFS, startcluster %lu, dircluster %lu, diroffset %lu ",
1861 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
1862 printf(" dev %d, %d", major(dep->de_dev), minor(dep->de_dev));
3446c007 1863 lockmgr_printinfo(&ap->a_vp->v_lock);
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1864 printf("\n");
1865 return (0);
1866}
1867
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1868/*
1869 * msdosfs_pathconf(struct vnode *a_vp, int a_name, int *a_retval)
1870 */
984263bc 1871static int
4625f023 1872msdosfs_pathconf(struct vop_pathconf_args *ap)
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1873{
1874 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp;
1875
1876 switch (ap->a_name) {
1877 case _PC_LINK_MAX:
1878 *ap->a_retval = 1;
1879 return (0);
1880 case _PC_NAME_MAX:
1881 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12;
1882 return (0);
1883 case _PC_PATH_MAX:
1884 *ap->a_retval = PATH_MAX;
1885 return (0);
1886 case _PC_CHOWN_RESTRICTED:
1887 *ap->a_retval = 1;
1888 return (0);
1889 case _PC_NO_TRUNC:
1890 *ap->a_retval = 0;
1891 return (0);
1892 default:
1893 return (EINVAL);
1894 }
1895 /* NOTREACHED */
1896}
1897
1898/*
1899 * get page routine
1900 *
1901 * XXX By default, wimp out... note that a_offset is ignored (and always
1902 * XXX has been).
1903 */
1904int
4625f023 1905msdosfs_getpages(struct vop_getpages_args *ap)
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1906{
1907 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count,
1908 ap->a_reqpage);
1909}
1910
1911/*
1912 * put page routine
1913 *
1914 * XXX By default, wimp out... note that a_offset is ignored (and always
1915 * XXX has been).
1916 */
1917int
4625f023 1918msdosfs_putpages(struct vop_putpages_args *ap)
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1919{
1920 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
1921 ap->a_sync, ap->a_rtvals);
1922}
1923
1924/* Global vfs data structures for msdosfs */
0961aa92 1925struct vnodeopv_entry_desc msdosfs_vnodeop_entries[] = {
2d3e977e 1926 { &vop_default_desc, vop_defaultop },
625ddaba
JS
1927 { &vop_access_desc, (vnodeopv_entry_t) msdosfs_access },
1928 { &vop_bmap_desc, (vnodeopv_entry_t) msdosfs_bmap },
1929 { &vop_lookup_desc, (vnodeopv_entry_t) msdosfs_lookup },
1930 { &vop_close_desc, (vnodeopv_entry_t) msdosfs_close },
1931 { &vop_create_desc, (vnodeopv_entry_t) msdosfs_create },
1932 { &vop_fsync_desc, (vnodeopv_entry_t) msdosfs_fsync },
1933 { &vop_getattr_desc, (vnodeopv_entry_t) msdosfs_getattr },
1934 { &vop_inactive_desc, (vnodeopv_entry_t) msdosfs_inactive },
1935 { &vop_islocked_desc, (vnodeopv_entry_t) vop_stdislocked },
1936 { &vop_link_desc, (vnodeopv_entry_t) msdosfs_link },
1937 { &vop_lock_desc, (vnodeopv_entry_t) vop_stdlock },
1938 { &vop_mkdir_desc, (vnodeopv_entry_t) msdosfs_mkdir },
1939 { &vop_mknod_desc, (vnodeopv_entry_t) msdosfs_mknod },
1940 { &vop_pathconf_desc, (vnodeopv_entry_t) msdosfs_pathconf },
1941 { &vop_print_desc, (vnodeopv_entry_t) msdosfs_print },
1942 { &vop_read_desc, (vnodeopv_entry_t) msdosfs_read },
1943 { &vop_readdir_desc, (vnodeopv_entry_t) msdosfs_readdir },
1944 { &vop_reclaim_desc, (vnodeopv_entry_t) msdosfs_reclaim },
1945 { &vop_remove_desc, (vnodeopv_entry_t) msdosfs_remove },
1946 { &vop_rename_desc, (vnodeopv_entry_t) msdosfs_rename },
1947 { &vop_rmdir_desc, (vnodeopv_entry_t) msdosfs_rmdir },
1948 { &vop_setattr_desc, (vnodeopv_entry_t) msdosfs_setattr },
1949 { &vop_strategy_desc, (vnodeopv_entry_t) msdosfs_strategy },
1950 { &vop_symlink_desc, (vnodeopv_entry_t) msdosfs_symlink },
1951 { &vop_unlock_desc, (vnodeopv_entry_t) vop_stdunlock },
1952 { &vop_write_desc, (vnodeopv_entry_t) msdosfs_write },
1953 { &vop_getpages_desc, (vnodeopv_entry_t) msdosfs_getpages },
1954 { &vop_putpages_desc, (vnodeopv_entry_t) msdosfs_putpages },
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1955 { NULL, NULL }
1956};