AMD64 - Refactor uio_resid and size_t assumptions.
[dragonfly.git] / sys / vfs / msdosfs / msdosfs_vnops.c
CommitLineData
984263bc 1/* $FreeBSD: src/sys/msdosfs/msdosfs_vnops.c,v 1.95.2.4 2003/06/13 15:05:47 trhodes Exp $ */
84009d92 2/* $DragonFly: src/sys/vfs/msdosfs/msdosfs_vnops.c,v 1.54 2007/11/20 21:03:50 dillon Exp $ */
984263bc
MD
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>
984263bc
MD
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>
895c1f85 59#include <sys/priv.h>
dadab5e9 60#include <sys/namei.h>
984263bc
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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/vm_zone.h>
71#include <vm/vnode_pager.h>
72
3020e3be
MD
73#include <sys/buf2.h>
74
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MD
75#include "bpb.h"
76#include "direntry.h"
77#include "denode.h"
78#include "msdosfsmount.h"
79#include "fat.h"
984263bc
MD
80
81#define DOS_FILESIZE_MAX 0xffffffff
82
83/*
84 * Prototypes for MSDOSFS vnode operations
85 */
e62afb5f
MD
86static int msdosfs_create (struct vop_old_create_args *);
87static int msdosfs_mknod (struct vop_old_mknod_args *);
7540ab49 88static int msdosfs_open (struct vop_open_args *);
a6ee311a
RG
89static int msdosfs_close (struct vop_close_args *);
90static int msdosfs_access (struct vop_access_args *);
91static int msdosfs_getattr (struct vop_getattr_args *);
92static int msdosfs_setattr (struct vop_setattr_args *);
93static int msdosfs_read (struct vop_read_args *);
94static int msdosfs_write (struct vop_write_args *);
95static int msdosfs_fsync (struct vop_fsync_args *);
e62afb5f
MD
96static int msdosfs_remove (struct vop_old_remove_args *);
97static int msdosfs_link (struct vop_old_link_args *);
98static int msdosfs_rename (struct vop_old_rename_args *);
99static int msdosfs_mkdir (struct vop_old_mkdir_args *);
100static int msdosfs_rmdir (struct vop_old_rmdir_args *);
101static int msdosfs_symlink (struct vop_old_symlink_args *);
a6ee311a
RG
102static int msdosfs_readdir (struct vop_readdir_args *);
103static int msdosfs_bmap (struct vop_bmap_args *);
104static int msdosfs_strategy (struct vop_strategy_args *);
105static int msdosfs_print (struct vop_print_args *);
106static int msdosfs_pathconf (struct vop_pathconf_args *ap);
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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.
4625f023
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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)
984263bc
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132 */
133static int
e62afb5f 134msdosfs_create(struct vop_old_create_args *ap)
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MD
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
086c1d7e 144 kprintf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap);
984263bc
MD
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 */
984263bc
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
4625f023
CP
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
e62afb5f 195msdosfs_mknod(struct vop_old_mknod_args *ap)
984263bc 196{
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197 switch (ap->a_vap->va_type) {
198 case VDIR:
e62afb5f 199 return (msdosfs_mkdir((struct vop_old_mkdir_args *)ap));
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200 break;
201
202 case VREG:
e62afb5f 203 return (msdosfs_create((struct vop_old_create_args *)ap));
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204 break;
205
206 default:
207 return (EINVAL);
208 }
209 /* NOTREACHED */
210}
211
4625f023 212/*
b478fdce
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213 * msdosfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
214 * struct file *a_fp)
7540ab49
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215 */
216static int
217msdosfs_open(struct vop_open_args *ap)
218{
8ddc6004 219 return(vop_stdopen(ap));
7540ab49
MD
220}
221
222/*
b478fdce 223 * msdosfs_close(struct vnode *a_vp, int a_fflag)
4625f023 224 */
984263bc 225static int
4625f023 226msdosfs_close(struct vop_close_args *ap)
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MD
227{
228 struct vnode *vp = ap->a_vp;
229 struct denode *dep = VTODE(vp);
230 struct timespec ts;
231
3c37c940 232 if (vp->v_sysref.refcnt > 1) {
984263bc 233 getnanotime(&ts);
3c37c940 234 DETIMES(dep, &ts, &ts, &ts);
984263bc 235 }
8ddc6004 236 return (vop_stdclose(ap));
984263bc
MD
237}
238
4625f023 239/*
b478fdce 240 * msdosfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred)
4625f023 241 */
984263bc 242static int
4625f023 243msdosfs_access(struct vop_access_args *ap)
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MD
244{
245 struct vnode *vp = ap->a_vp;
246 struct denode *dep = VTODE(ap->a_vp);
247 struct msdosfsmount *pmp = dep->de_pmp;
248 struct ucred *cred = ap->a_cred;
249 mode_t mask, file_mode, mode = ap->a_mode;
0e99e805 250 gid_t *gp;
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251 int i;
252
253 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) |
254 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH));
255 file_mode &= pmp->pm_mask;
256
257 /*
258 * Disallow write attempts on read-only file systems;
259 * unless the file is a socket, fifo, or a block or
260 * character device resident on the file system.
261 */
262 if (mode & VWRITE) {
263 switch (vp->v_type) {
264 case VDIR:
265 case VLNK:
266 case VREG:
267 if (vp->v_mount->mnt_flag & MNT_RDONLY)
268 return (EROFS);
269 break;
270 default:
271 break;
272 }
273 }
274
275 /* User id 0 always gets access. */
276 if (cred->cr_uid == 0)
277 return 0;
278
279 mask = 0;
280
281 /* Otherwise, check the owner. */
282 if (cred->cr_uid == pmp->pm_uid) {
283 if (mode & VEXEC)
284 mask |= S_IXUSR;
285 if (mode & VREAD)
286 mask |= S_IRUSR;
287 if (mode & VWRITE)
288 mask |= S_IWUSR;
289 return (file_mode & mask) == mask ? 0 : EACCES;
290 }
291
292 /* Otherwise, check the groups. */
293 for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
294 if (pmp->pm_gid == *gp) {
295 if (mode & VEXEC)
296 mask |= S_IXGRP;
297 if (mode & VREAD)
298 mask |= S_IRGRP;
299 if (mode & VWRITE)
300 mask |= S_IWGRP;
301 return (file_mode & mask) == mask ? 0 : EACCES;
302 }
303
304 /* Otherwise, check everyone else. */
305 if (mode & VEXEC)
306 mask |= S_IXOTH;
307 if (mode & VREAD)
308 mask |= S_IROTH;
309 if (mode & VWRITE)
310 mask |= S_IWOTH;
311 return (file_mode & mask) == mask ? 0 : EACCES;
312}
313
4625f023 314/*
b478fdce 315 * msdosfs_getattr(struct vnode *a_vp, struct vattr *a_vap)
4625f023 316 */
984263bc 317static int
4625f023 318msdosfs_getattr(struct vop_getattr_args *ap)
984263bc
MD
319{
320 struct denode *dep = VTODE(ap->a_vp);
321 struct msdosfsmount *pmp = dep->de_pmp;
322 struct vattr *vap = ap->a_vap;
323 mode_t mode;
324 struct timespec ts;
325 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
326 u_long fileid;
327
328 getnanotime(&ts);
329 DETIMES(dep, &ts, &ts, &ts);
330 vap->va_fsid = dev2udev(dep->de_dev);
331 /*
332 * The following computation of the fileid must be the same as that
333 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
334 * doesn't work.
335 */
336 if (dep->de_Attributes & ATTR_DIRECTORY) {
4afd80f1 337 fileid = xcntobn(pmp, dep->de_StartCluster) * dirsperblk;
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MD
338 if (dep->de_StartCluster == MSDOSFSROOT)
339 fileid = 1;
340 } else {
4afd80f1 341 fileid = xcntobn(pmp, dep->de_dirclust) * dirsperblk;
984263bc
MD
342 if (dep->de_dirclust == MSDOSFSROOT)
343 fileid = roottobn(pmp, 0) * dirsperblk;
344 fileid += dep->de_diroffset / sizeof(struct direntry);
345 }
346 vap->va_fileid = fileid;
347 if ((dep->de_Attributes & ATTR_READONLY) == 0)
348 mode = S_IRWXU|S_IRWXG|S_IRWXO;
349 else
350 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
351 vap->va_mode = mode & pmp->pm_mask;
352 vap->va_uid = pmp->pm_uid;
353 vap->va_gid = pmp->pm_gid;
354 vap->va_nlink = 1;
0e9b9130
MD
355 vap->va_rmajor = VNOVAL;
356 vap->va_rminor = VNOVAL;
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MD
357 vap->va_size = dep->de_FileSize;
358 dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime);
359 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
360 dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime);
361 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, &vap->va_ctime);
362 } else {
363 vap->va_atime = vap->va_mtime;
364 vap->va_ctime = vap->va_mtime;
365 }
366 vap->va_flags = 0;
367 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0)
368 vap->va_flags |= SF_ARCHIVED;
369 vap->va_gen = 0;
370 vap->va_blocksize = pmp->pm_bpcluster;
371 vap->va_bytes =
372 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
373 vap->va_type = ap->a_vp->v_type;
374 vap->va_filerev = dep->de_modrev;
375 return (0);
376}
377
4625f023
CP
378/*
379 * msdosfs_setattr(struct vnode *a_vp, struct vattr *a_vap,
b478fdce 380 * struct ucred *a_cred)
4625f023 381 */
984263bc 382static int
4625f023 383msdosfs_setattr(struct vop_setattr_args *ap)
984263bc
MD
384{
385 struct vnode *vp = ap->a_vp;
386 struct denode *dep = VTODE(ap->a_vp);
387 struct msdosfsmount *pmp = dep->de_pmp;
388 struct vattr *vap = ap->a_vap;
389 struct ucred *cred = ap->a_cred;
390 int error = 0;
391
392#ifdef MSDOSFS_DEBUG
0e63c0c7
SW
393 kprintf("msdosfs_setattr(): vp %p, vap %p, cred %p\n",
394 ap->a_vp, vap, cred);
984263bc
MD
395#endif
396
397 /*
398 * Check for unsettable attributes.
399 */
400 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
401 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
0e9b9130 402 (vap->va_blocksize != VNOVAL) || (vap->va_rmajor != VNOVAL) ||
984263bc
MD
403 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
404#ifdef MSDOSFS_DEBUG
086c1d7e 405 kprintf("msdosfs_setattr(): returning EINVAL\n");
50626622 406 kprintf(" va_type %d, va_nlink %llx, va_fsid %x, va_fileid %llx\n",
984263bc 407 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid);
50626622 408 kprintf(" va_blocksize %lx, va_rmajor %x, va_bytes %qx, va_gen %llx\n",
0e9b9130 409 vap->va_blocksize, vap->va_rmajor, vap->va_bytes, vap->va_gen);
086c1d7e 410 kprintf(" va_uid %x, va_gid %x\n",
984263bc
MD
411 vap->va_uid, vap->va_gid);
412#endif
413 return (EINVAL);
414 }
415 if (vap->va_flags != VNOVAL) {
416 if (vp->v_mount->mnt_flag & MNT_RDONLY)
417 return (EROFS);
418 if (cred->cr_uid != pmp->pm_uid &&
db813a0c 419 (error = priv_check_cred(cred, PRIV_VFS_SETATTR, 0)))
984263bc
MD
420 return (error);
421 /*
422 * We are very inconsistent about handling unsupported
423 * attributes. We ignored the access time and the
424 * read and execute bits. We were strict for the other
425 * attributes.
426 *
427 * Here we are strict, stricter than ufs in not allowing
428 * users to attempt to set SF_SETTABLE bits or anyone to
429 * set unsupported bits. However, we ignore attempts to
430 * set ATTR_ARCHIVE for directories `cp -pr' from a more
431 * sensible file system attempts it a lot.
432 */
433 if (cred->cr_uid != 0) {
434 if (vap->va_flags & SF_SETTABLE)
435 return EPERM;
436 }
437 if (vap->va_flags & ~SF_ARCHIVED)
438 return EOPNOTSUPP;
439 if (vap->va_flags & SF_ARCHIVED)
440 dep->de_Attributes &= ~ATTR_ARCHIVE;
441 else if (!(dep->de_Attributes & ATTR_DIRECTORY))
442 dep->de_Attributes |= ATTR_ARCHIVE;
443 dep->de_flag |= DE_MODIFIED;
444 }
445
446 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
447 uid_t uid;
448 gid_t gid;
449
450 if (vp->v_mount->mnt_flag & MNT_RDONLY)
451 return (EROFS);
452 uid = vap->va_uid;
453 if (uid == (uid_t)VNOVAL)
454 uid = pmp->pm_uid;
455 gid = vap->va_gid;
456 if (gid == (gid_t)VNOVAL)
457 gid = pmp->pm_gid;
458 if ((cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid ||
459 (gid != pmp->pm_gid && !groupmember(gid, cred))) &&
db813a0c 460 (error = priv_check_cred(cred, PRIV_VFS_SETATTR, 0)))
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MD
461 return error;
462 if (uid != pmp->pm_uid || gid != pmp->pm_gid)
463 return EINVAL;
464 }
465
466 if (vap->va_size != VNOVAL) {
467 /*
468 * Disallow write attempts on read-only file systems;
469 * unless the file is a socket, fifo, or a block or
470 * character device resident on the file system.
471 */
472 switch (vp->v_type) {
473 case VDIR:
474 return (EISDIR);
475 /* NOT REACHED */
476 case VLNK:
477 case VREG:
478 if (vp->v_mount->mnt_flag & MNT_RDONLY)
479 return (EROFS);
480 break;
481 default:
482 break;
483 }
87de5057 484 error = detrunc(dep, vap->va_size, 0);
984263bc
MD
485 if (error)
486 return error;
487 }
488 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
489 if (vp->v_mount->mnt_flag & MNT_RDONLY)
490 return (EROFS);
491 if (cred->cr_uid != pmp->pm_uid &&
db813a0c 492 (error = priv_check_cred(cred, PRIV_VFS_SETATTR, 0)) &&
984263bc 493 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
87de5057 494 (error = VOP_ACCESS(ap->a_vp, VWRITE, cred))))
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MD
495 return (error);
496 if (vp->v_type != VDIR) {
497 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 &&
498 vap->va_atime.tv_sec != VNOVAL) {
499 dep->de_flag &= ~DE_ACCESS;
500 unix2dostime(&vap->va_atime, &dep->de_ADate,
501 NULL, NULL);
502 }
503 if (vap->va_mtime.tv_sec != VNOVAL) {
504 dep->de_flag &= ~DE_UPDATE;
505 unix2dostime(&vap->va_mtime, &dep->de_MDate,
506 &dep->de_MTime, NULL);
507 }
508 dep->de_Attributes |= ATTR_ARCHIVE;
509 dep->de_flag |= DE_MODIFIED;
510 }
511 }
512 /*
513 * DOS files only have the ability to have their writability
514 * attribute set, so we use the owner write bit to set the readonly
515 * attribute.
516 */
517 if (vap->va_mode != (mode_t)VNOVAL) {
518 if (vp->v_mount->mnt_flag & MNT_RDONLY)
519 return (EROFS);
520 if (cred->cr_uid != pmp->pm_uid &&
db813a0c 521 (error = priv_check_cred(cred, PRIV_VFS_SETATTR, 0)))
984263bc
MD
522 return (error);
523 if (vp->v_type != VDIR) {
524 /* We ignore the read and execute bits. */
525 if (vap->va_mode & VWRITE)
526 dep->de_Attributes &= ~ATTR_READONLY;
527 else
528 dep->de_Attributes |= ATTR_READONLY;
529 dep->de_Attributes |= ATTR_ARCHIVE;
530 dep->de_flag |= DE_MODIFIED;
531 }
532 }
533 return (deupdat(dep, 1));
534}
535
4625f023
CP
536/*
537 * msdosfs_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
538 * struct ucred *a_cred)
539 */
984263bc 540static int
4625f023 541msdosfs_read(struct vop_read_args *ap)
984263bc
MD
542{
543 int error = 0;
544 int blsize;
545 int isadir;
e54488bb 546 size_t orig_resid;
984263bc
MD
547 u_int n;
548 u_long diff;
549 u_long on;
550 daddr_t lbn;
551 daddr_t rablock;
54078292
MD
552 off_t raoffset;
553 off_t loffset;
984263bc
MD
554 int rasize;
555 int seqcount;
556 struct buf *bp;
557 struct vnode *vp = ap->a_vp;
558 struct denode *dep = VTODE(vp);
559 struct msdosfsmount *pmp = dep->de_pmp;
560 struct uio *uio = ap->a_uio;
561
562 if (uio->uio_offset < 0)
563 return (EINVAL);
564
565 if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX)
566 return (0);
567 /*
568 * If they didn't ask for any data, then we are done.
569 */
570 orig_resid = uio->uio_resid;
e54488bb 571 if (orig_resid == 0)
984263bc
MD
572 return (0);
573
574 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
575
576 isadir = dep->de_Attributes & ATTR_DIRECTORY;
577 do {
578 if (uio->uio_offset >= dep->de_FileSize)
579 break;
4afd80f1
MD
580
581 /*
582 * note: lbn is a cluster number, not a device block number.
583 */
584 lbn = de_off2cn(pmp, uio->uio_offset);
585 loffset = de_cn2doff(pmp, lbn);
586
984263bc
MD
587 /*
588 * If we are operating on a directory file then be sure to
589 * do i/o with the vnode for the filesystem instead of the
590 * vnode for the directory.
591 */
592 if (isadir) {
4afd80f1
MD
593 /*
594 * convert cluster # to block #. lbn is a
595 * device block number after this.
596 */
597 error = pcbmap(dep, lbn, &lbn, NULL, &blsize);
598 loffset = de_bntodoff(pmp, lbn);
984263bc
MD
599 if (error == E2BIG) {
600 error = EINVAL;
601 break;
602 } else if (error)
603 break;
54078292 604 error = bread(pmp->pm_devvp, loffset, blsize, &bp);
984263bc
MD
605 } else {
606 blsize = pmp->pm_bpcluster;
607 rablock = lbn + 1;
4afd80f1 608 raoffset = de_cn2doff(pmp, rablock);
984263bc 609 if (seqcount > 1 &&
54078292 610 raoffset < dep->de_FileSize) {
984263bc 611 rasize = pmp->pm_bpcluster;
54078292
MD
612 error = breadn(vp, loffset, blsize,
613 &raoffset, &rasize, 1, &bp);
984263bc 614 } else {
54078292 615 error = bread(vp, loffset, blsize, &bp);
984263bc
MD
616 }
617 }
618 if (error) {
619 brelse(bp);
620 break;
621 }
622 on = uio->uio_offset & pmp->pm_crbomask;
623 diff = pmp->pm_bpcluster - on;
e54488bb 624 n = szmin(uio->uio_resid, diff);
984263bc
MD
625 diff = dep->de_FileSize - uio->uio_offset;
626 if (diff < n)
627 n = diff;
628 diff = blsize - bp->b_resid;
629 if (diff < n)
630 n = diff;
e54488bb 631 error = uiomove(bp->b_data + on, (size_t)n, uio);
984263bc
MD
632 brelse(bp);
633 } while (error == 0 && uio->uio_resid > 0 && n != 0);
634 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) &&
635 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
636 dep->de_flag |= DE_ACCESS;
637 return (error);
638}
639
640/*
641 * Write data to a file or directory.
4625f023
CP
642 *
643 * msdosfs_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
644 * struct ucred *a_cred)
984263bc
MD
645 */
646static int
4625f023 647msdosfs_write(struct vop_write_args *ap)
984263bc
MD
648{
649 int n;
650 int croffset;
e54488bb 651 size_t resid;
984263bc
MD
652 u_long osize;
653 int error = 0;
654 u_long count;
4afd80f1 655 daddr_t cn, lastcn;
984263bc
MD
656 struct buf *bp;
657 int ioflag = ap->a_ioflag;
658 struct uio *uio = ap->a_uio;
dadab5e9 659 struct thread *td = uio->uio_td;
984263bc
MD
660 struct vnode *vp = ap->a_vp;
661 struct vnode *thisvp;
662 struct denode *dep = VTODE(vp);
663 struct msdosfsmount *pmp = dep->de_pmp;
049d6e6d 664 struct proc *p = (td ? td->td_proc : NULL);
7278a846 665 struct lwp *lp = (td ? td->td_lwp : NULL);
984263bc
MD
666
667#ifdef MSDOSFS_DEBUG
086c1d7e 668 kprintf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
0e63c0c7 669 vp, uio, ioflag, ap->a_cred);
086c1d7e 670 kprintf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
984263bc
MD
671 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
672#endif
673
674 switch (vp->v_type) {
675 case VREG:
676 if (ioflag & IO_APPEND)
677 uio->uio_offset = dep->de_FileSize;
678 thisvp = vp;
679 break;
680 case VDIR:
681 return EISDIR;
682 default:
683 panic("msdosfs_write(): bad file type");
684 }
685
686 if (uio->uio_offset < 0)
687 return (EFBIG);
688
689 if (uio->uio_resid == 0)
690 return (0);
691
692 /*
693 * If they've exceeded their filesize limit, tell them about it.
694 */
695 if (p &&
696 ((uoff_t)uio->uio_offset + uio->uio_resid >
697 p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) {
7278a846 698 lwpsignal(p, lp, SIGXFSZ);
984263bc
MD
699 return (EFBIG);
700 }
701
e54488bb
MD
702 if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX)
703 return (EFBIG);
984263bc
MD
704 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX)
705 return (EFBIG);
706
707 /*
708 * If the offset we are starting the write at is beyond the end of
709 * the file, then they've done a seek. Unix filesystems allow
710 * files with holes in them, DOS doesn't so we must fill the hole
711 * with zeroed blocks.
712 */
713 if (uio->uio_offset > dep->de_FileSize) {
3b568787 714 error = deextend(dep, uio->uio_offset);
984263bc
MD
715 if (error)
716 return (error);
717 }
718
719 /*
720 * Remember some values in case the write fails.
721 */
722 resid = uio->uio_resid;
723 osize = dep->de_FileSize;
724
725 /*
726 * If we write beyond the end of the file, extend it to its ultimate
727 * size ahead of the time to hopefully get a contiguous area.
728 */
729 if (uio->uio_offset + resid > osize) {
730 count = de_clcount(pmp, uio->uio_offset + resid) -
731 de_clcount(pmp, osize);
732 error = extendfile(dep, count, NULL, NULL, 0);
733 if (error && (error != ENOSPC || (ioflag & IO_UNIT)))
734 goto errexit;
735 lastcn = dep->de_fc[FC_LASTFC].fc_frcn;
736 } else
737 lastcn = de_clcount(pmp, osize) - 1;
738
739 do {
4afd80f1 740 if (de_off2cn(pmp, uio->uio_offset) > lastcn) {
984263bc
MD
741 error = ENOSPC;
742 break;
743 }
744
745 croffset = uio->uio_offset & pmp->pm_crbomask;
e54488bb 746 n = (int)szmin(uio->uio_resid, pmp->pm_bpcluster - croffset);
984263bc
MD
747 if (uio->uio_offset + n > dep->de_FileSize) {
748 dep->de_FileSize = uio->uio_offset + n;
749 /* The object size needs to be set before buffer is allocated */
750 vnode_pager_setsize(vp, dep->de_FileSize);
751 }
752
8aa7625b
MD
753 /*
754 * If either the whole cluster gets written, or we write
755 * the cluster from its start beyond EOF, then no need to
756 * read data from disk.
757 *
758 * If UIO_NOCOPY is set we have to do a read-before-write
759 * to fill in any missing pieces of the buffer since no
760 * actual overwrite will occur.
761 */
4afd80f1 762 cn = de_off2cn(pmp, uio->uio_offset);
984263bc 763 if ((uio->uio_offset & pmp->pm_crbomask) == 0
8aa7625b 764 && uio->uio_segflg != UIO_NOCOPY
4afd80f1
MD
765 && (de_off2cn(pmp, uio->uio_offset + uio->uio_resid)
766 > de_off2cn(pmp, uio->uio_offset)
984263bc 767 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) {
4afd80f1 768 bp = getblk(thisvp, de_cn2doff(pmp, cn),
54078292 769 pmp->pm_bpcluster, 0, 0);
984263bc
MD
770 clrbuf(bp);
771 /*
772 * Do the bmap now, since pcbmap needs buffers
773 * for the fat table. (see msdosfs_strategy)
774 */
54078292 775 if (bp->b_bio2.bio_offset == NOOFFSET) {
4afd80f1 776 daddr_t lblkno = de_off2cn(pmp, bp->b_loffset);
54078292
MD
777 daddr_t dblkno;
778
4afd80f1
MD
779 error = pcbmap(dep, lblkno,
780 &dblkno, NULL, NULL);
54078292
MD
781 if (error || dblkno == (daddr_t)-1) {
782 bp->b_bio2.bio_offset = NOOFFSET;
783 } else {
4afd80f1 784 bp->b_bio2.bio_offset = de_bntodoff(pmp, dblkno);
54078292 785 }
984263bc 786 }
54078292 787 if (bp->b_bio2.bio_offset == NOOFFSET) {
984263bc
MD
788 brelse(bp);
789 if (!error)
790 error = EIO; /* XXX */
791 break;
792 }
793 } else {
794 /*
4afd80f1
MD
795 * The block we need to write into exists, so read
796 * it in.
984263bc 797 */
4afd80f1
MD
798 error = bread(thisvp, de_cn2doff(pmp, cn),
799 pmp->pm_bpcluster, &bp);
984263bc
MD
800 if (error) {
801 brelse(bp);
802 break;
803 }
804 }
805
806 /*
807 * Should these vnode_pager_* functions be done on dir
808 * files?
809 */
810
811 /*
812 * Copy the data from user space into the buf header.
813 */
e54488bb 814 error = uiomove(bp->b_data + croffset, (size_t)n, uio);
984263bc
MD
815 if (error) {
816 brelse(bp);
817 break;
818 }
819
820 /*
821 * If they want this synchronous then write it and wait for
822 * it. Otherwise, if on a cluster boundary write it
823 * asynchronously so we can move on to the next block
824 * without delay. Otherwise do a delayed write because we
825 * may want to write somemore into the block later.
826 */
827 if (ioflag & IO_SYNC)
b1ce5639 828 bwrite(bp);
984263bc
MD
829 else if (n + croffset == pmp->pm_bpcluster)
830 bawrite(bp);
831 else
832 bdwrite(bp);
833 dep->de_flag |= DE_UPDATE;
834 } while (error == 0 && uio->uio_resid > 0);
835
836 /*
837 * If the write failed and they want us to, truncate the file back
838 * to the size it was before the write was attempted.
839 */
840errexit:
841 if (error) {
842 if (ioflag & IO_UNIT) {
87de5057 843 detrunc(dep, osize, ioflag & IO_SYNC);
984263bc
MD
844 uio->uio_offset -= resid - uio->uio_resid;
845 uio->uio_resid = resid;
846 } else {
87de5057 847 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC);
984263bc
MD
848 if (uio->uio_resid != resid)
849 error = 0;
850 }
851 } else if (ioflag & IO_SYNC)
852 error = deupdat(dep, 1);
853 return (error);
854}
855
856/*
857 * Flush the blocks of a file to disk.
858 *
859 * This function is worthless for vnodes that represent directories. Maybe we
860 * could just do a sync if they try an fsync on a directory file.
4625f023 861 *
b478fdce 862 * msdosfs_fsync(struct vnode *a_vp, int a_waitfor)
984263bc
MD
863 */
864static int
4625f023 865msdosfs_fsync(struct vop_fsync_args *ap)
984263bc
MD
866{
867 struct vnode *vp = ap->a_vp;
984263bc
MD
868
869 /*
870 * Flush all dirty buffers associated with a vnode.
871 */
6bae6177 872#ifdef DIAGNOSTIC
984263bc 873loop:
6bae6177 874#endif
4e0ecc94 875 vfsync(vp, ap->a_waitfor, 0, NULL, NULL);
984263bc 876#ifdef DIAGNOSTIC
6bae6177 877 if (ap->a_waitfor == MNT_WAIT && !RB_EMPTY(&vp->v_rbdirty_tree)) {
984263bc
MD
878 vprint("msdosfs_fsync: dirty", vp);
879 goto loop;
880 }
881#endif
984263bc
MD
882 return (deupdat(VTODE(vp), ap->a_waitfor == MNT_WAIT));
883}
884
4625f023
CP
885/*
886 * msdosfs_remove(struct vnode *a_dvp, struct vnode *a_vp,
887 * struct componentname *a_cnp)
888 */
984263bc 889static int
e62afb5f 890msdosfs_remove(struct vop_old_remove_args *ap)
984263bc
MD
891{
892 struct denode *dep = VTODE(ap->a_vp);
893 struct denode *ddep = VTODE(ap->a_dvp);
894 int error;
895
896 if (ap->a_vp->v_type == VDIR)
897 error = EPERM;
898 else
899 error = removede(ddep, dep);
900#ifdef MSDOSFS_DEBUG
3c37c940
MD
901 kprintf("msdosfs_remove(), dep %p, v_sysrefs %d\n",
902 dep, ap->a_vp->v_sysref.refcnt);
984263bc
MD
903#endif
904 return (error);
905}
906
907/*
908 * DOS filesystems don't know what links are. But since we already called
909 * msdosfs_lookup() with create and lockparent, the parent is locked so we
910 * have to free it before we return the error.
4625f023
CP
911 *
912 * msdosfs_link(struct vnode *a_tdvp, struct vnode *a_vp,
913 * struct componentname *a_cnp)
984263bc
MD
914 */
915static int
e62afb5f 916msdosfs_link(struct vop_old_link_args *ap)
984263bc
MD
917{
918 return (EOPNOTSUPP);
919}
920
921/*
922 * Renames on files require moving the denode to a new hash queue since the
923 * denode's location is used to compute which hash queue to put the file
924 * in. Unless it is a rename in place. For example "mv a b".
925 *
926 * What follows is the basic algorithm:
927 *
928 * if (file move) {
929 * if (dest file exists) {
930 * remove dest file
931 * }
932 * if (dest and src in same directory) {
933 * rewrite name in existing directory slot
934 * } else {
935 * write new entry in dest directory
936 * update offset and dirclust in denode
937 * move denode to new hash chain
938 * clear old directory entry
939 * }
940 * } else {
941 * directory move
942 * if (dest directory exists) {
943 * if (dest is not empty) {
944 * return ENOTEMPTY
945 * }
946 * remove dest directory
947 * }
948 * if (dest and src in same directory) {
949 * rewrite name in existing entry
950 * } else {
951 * be sure dest is not a child of src directory
952 * write entry in dest directory
953 * update "." and ".." in moved directory
954 * clear old directory entry for moved directory
955 * }
956 * }
957 *
958 * On entry:
959 * source's parent directory is unlocked
960 * source file or directory is unlocked
961 * destination's parent directory is locked
962 * destination file or directory is locked if it exists
963 *
964 * On exit:
965 * all denodes should be released
966 *
967 * Notes:
968 * I'm not sure how the memory containing the pathnames pointed at by the
969 * componentname structures is freed, there may be some memory bleeding
970 * for each rename done.
4625f023
CP
971 *
972 * msdosfs_rename(struct vnode *a_fdvp, struct vnode *a_fvp,
973 * struct componentname *a_fcnp, struct vnode *a_tdvp,
974 * struct vnode *a_tvp, struct componentname *a_tcnp)
984263bc
MD
975 */
976static int
e62afb5f 977msdosfs_rename(struct vop_old_rename_args *ap)
984263bc
MD
978{
979 struct vnode *tdvp = ap->a_tdvp;
980 struct vnode *fvp = ap->a_fvp;
981 struct vnode *fdvp = ap->a_fdvp;
982 struct vnode *tvp = ap->a_tvp;
983 struct componentname *tcnp = ap->a_tcnp;
984 struct componentname *fcnp = ap->a_fcnp;
984263bc
MD
985 struct denode *ip, *xp, *dp, *zp;
986 u_char toname[11], oldname[11];
987 u_long from_diroffset, to_diroffset;
988 u_char to_count;
989 int doingdirectory = 0, newparent = 0;
990 int error;
991 u_long cn;
992 daddr_t bn;
984263bc
MD
993 struct msdosfsmount *pmp;
994 struct direntry *dotdotp;
995 struct buf *bp;
996
984263bc
MD
997 pmp = VFSTOMSDOSFS(fdvp->v_mount);
998
984263bc
MD
999 /*
1000 * Check for cross-device rename.
1001 */
1002 if ((fvp->v_mount != tdvp->v_mount) ||
1003 (tvp && (fvp->v_mount != tvp->v_mount))) {
1004 error = EXDEV;
1005abortit:
1006 if (tdvp == tvp)
1007 vrele(tdvp);
1008 else
1009 vput(tdvp);
1010 if (tvp)
1011 vput(tvp);
1012 vrele(fdvp);
1013 vrele(fvp);
1014 return (error);
1015 }
1016
1017 /*
1018 * If source and dest are the same, do nothing.
1019 */
1020 if (tvp == fvp) {
1021 error = 0;
1022 goto abortit;
1023 }
1024
fad57d0e
MD
1025 /*
1026 * fvp, fdvp are unlocked, tvp, tdvp are locked. Lock fvp and note
1027 * that we have to unlock it to use the abortit target.
1028 */
ca466bae 1029 error = vn_lock(fvp, LK_EXCLUSIVE);
984263bc
MD
1030 if (error)
1031 goto abortit;
1032 dp = VTODE(fdvp);
1033 ip = VTODE(fvp);
1034
1035 /*
1036 * Be sure we are not renaming ".", "..", or an alias of ".". This
1037 * leads to a crippled directory tree. It's pretty tough to do a
1038 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
1039 * doesn't work if the ".." entry is missing.
1040 */
1041 if (ip->de_Attributes & ATTR_DIRECTORY) {
1042 /*
1043 * Avoid ".", "..", and aliases of "." for obvious reasons.
1044 */
1045 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
1046 dp == ip ||
2b69e610
MD
1047 (fcnp->cn_flags & CNP_ISDOTDOT) ||
1048 (tcnp->cn_flags & CNP_ISDOTDOT) ||
984263bc 1049 (ip->de_flag & DE_RENAME)) {
a11aaa81 1050 vn_unlock(fvp);
984263bc
MD
1051 error = EINVAL;
1052 goto abortit;
1053 }
1054 ip->de_flag |= DE_RENAME;
1055 doingdirectory++;
1056 }
1057
1058 /*
fad57d0e
MD
1059 * fvp locked, fdvp unlocked, tvp, tdvp locked. DE_RENAME only
1060 * set if doingdirectory. We will get fvp unlocked in fairly
1061 * short order. dp and xp must be setup and fvp must be unlocked
1062 * for the out and bad targets to work properly.
984263bc
MD
1063 */
1064 dp = VTODE(tdvp);
1065 xp = tvp ? VTODE(tvp) : NULL;
fad57d0e 1066
984263bc
MD
1067 /*
1068 * Remember direntry place to use for destination
1069 */
1070 to_diroffset = dp->de_fndoffset;
1071 to_count = dp->de_fndcnt;
1072
1073 /*
1074 * If ".." must be changed (ie the directory gets a new
1075 * parent) then the source directory must not be in the
1076 * directory heirarchy above the target, as this would
1077 * orphan everything below the source directory. Also
1078 * the user must have write permission in the source so
1079 * as to be able to change "..". We must repeat the call
1080 * to namei, as the parent directory is unlocked by the
1081 * call to doscheckpath().
1082 */
87de5057 1083 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred);
a11aaa81 1084 vn_unlock(fvp);
984263bc
MD
1085 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
1086 newparent = 1;
fad57d0e
MD
1087
1088 /*
1089 * ok. fvp, fdvp unlocked, tvp, tdvp locked. tvp may be NULL.
1090 * DE_RENAME only set if doingdirectory.
1091 */
984263bc
MD
1092 if (doingdirectory && newparent) {
1093 if (error) /* write access check above */
1094 goto bad;
fad57d0e 1095 if (xp != NULL) {
984263bc 1096 vput(tvp);
fad57d0e
MD
1097 xp = NULL;
1098 }
984263bc 1099 /*
fad57d0e
MD
1100 * checkpath vput's tdvp (VTOI(dp)) on return no matter what,
1101 * get an extra ref so we wind up with just an unlocked, ref'd
1102 * tdvp. The 'out' target skips tvp and tdvp cleanups (tdvp
1103 * isn't locked so we can't use the out target).
984263bc 1104 */
fad57d0e 1105 vref(tdvp);
984263bc 1106 error = doscheckpath(ip, dp);
6970b52a 1107 tcnp->cn_flags |= CNP_PDIRUNLOCK;
fad57d0e
MD
1108 if (error) {
1109 vrele(tdvp);
984263bc 1110 goto out;
fad57d0e
MD
1111 }
1112 /*
1113 * relookup no longer messes with the ref count. tdvp must
1114 * be unlocked on entry and on success will be locked on
1115 * return.
1116 */
984263bc 1117 error = relookup(tdvp, &tvp, tcnp);
fad57d0e
MD
1118 if (error) {
1119 if (tcnp->cn_flags & CNP_PDIRUNLOCK)
1120 vrele(tdvp);
1121 else
1122 vput(tdvp);
984263bc 1123 goto out;
fad57d0e
MD
1124 }
1125
1126 /*
1127 * tvp and tdvp are now locked again.
1128 */
984263bc
MD
1129 dp = VTODE(tdvp);
1130 xp = tvp ? VTODE(tvp) : NULL;
1131 }
1132
fad57d0e
MD
1133 /*
1134 * tvp and tdvp are now locked again, the 'bad' target can be used
1135 * to clean them up again. Delete an existant target and clean
1136 * up tvp. Set xp to NULL to indicate that tvp has been cleaned up.
1137 */
984263bc
MD
1138 if (xp != NULL) {
1139 /*
1140 * Target must be empty if a directory and have no links
1141 * to it. Also, ensure source and target are compatible
1142 * (both directories, or both not directories).
1143 */
1144 if (xp->de_Attributes & ATTR_DIRECTORY) {
1145 if (!dosdirempty(xp)) {
1146 error = ENOTEMPTY;
1147 goto bad;
1148 }
1149 if (!doingdirectory) {
1150 error = ENOTDIR;
1151 goto bad;
1152 }
984263bc
MD
1153 } else if (doingdirectory) {
1154 error = EISDIR;
1155 goto bad;
1156 }
1157 error = removede(dp, xp);
1158 if (error)
1159 goto bad;
1160 vput(tvp);
1161 xp = NULL;
fad57d0e 1162 tvp = NULL;
984263bc
MD
1163 }
1164
1165 /*
1166 * Convert the filename in tcnp into a dos filename. We copy this
1167 * into the denode and directory entry for the destination
1168 * file/directory.
1169 */
1170 error = uniqdosname(VTODE(tdvp), tcnp, toname);
1171 if (error)
fad57d0e 1172 goto bad;
984263bc
MD
1173
1174 /*
fad57d0e
MD
1175 * Since from wasn't locked at various places above, we have to do
1176 * a relookup here. If the target and source are the same directory
1177 * we have to unlock the target directory in order to safely relookup
1178 * the source, because relookup expects its directory to be unlocked.
1179 *
1180 * Note that ap->a_fvp is still valid and ref'd. Any cleanup must
1181 * now take that into account.
1182 *
1183 * The tdvp locking issues make this a real mess.
984263bc 1184 */
2b69e610 1185 fcnp->cn_flags &= ~CNP_MODMASK;
fad57d0e
MD
1186 fcnp->cn_flags |= CNP_LOCKPARENT;
1187 if (newparent == 0)
a11aaa81 1188 vn_unlock(tdvp);
fad57d0e
MD
1189 error = relookup(fdvp, &fvp, fcnp);
1190 if (error || fvp == NULL) {
984263bc 1191 /*
fad57d0e
MD
1192 * From name has disappeared. Note: fdvp might == tdvp.
1193 *
1194 * DE_RENAME is only set if doingdirectory.
984263bc
MD
1195 */
1196 if (doingdirectory)
1197 panic("rename: lost dir entry");
fad57d0e
MD
1198 if (fcnp->cn_flags & CNP_PDIRUNLOCK)
1199 vrele(fdvp);
1200 else
1201 vput(fdvp);
1202 if (newparent == 0)
1203 vrele(tdvp);
1204 else
1205 vput(tdvp);
984263bc 1206 vrele(ap->a_fvp);
fad57d0e 1207 return(0);
984263bc 1208 }
fad57d0e
MD
1209
1210 /*
1211 * No error occured. tdvp, fdvp and fvp are all locked. If
1212 * newparent was 0 be aware that fdvp == tdvp. tvp has been cleaned
1213 * up. ap->a_fvp is still refd.
1214 */
984263bc
MD
1215 xp = VTODE(fvp);
1216 zp = VTODE(fdvp);
1217 from_diroffset = zp->de_fndoffset;
1218
1219 /*
1220 * Ensure that the directory entry still exists and has not
1221 * changed till now. If the source is a file the entry may
1222 * have been unlinked or renamed. In either case there is
1223 * no further work to be done. If the source is a directory
1224 * then it cannot have been rmdir'ed or renamed; this is
1225 * prohibited by the DE_RENAME flag.
fad57d0e
MD
1226 *
1227 * DE_RENAME is only set if doingdirectory.
984263bc
MD
1228 */
1229 if (xp != ip) {
1230 if (doingdirectory)
1231 panic("rename: lost dir entry");
fad57d0e 1232 goto done;
984263bc 1233 } else {
3446c007
MD
1234 u_long new_dirclust;
1235 u_long new_diroffset;
1236
984263bc
MD
1237 /*
1238 * First write a new entry in the destination
1239 * directory and mark the entry in the source directory
1240 * as deleted. Then move the denode to the correct hash
1241 * chain for its new location in the filesystem. And, if
1242 * we moved a directory, then update its .. entry to point
1243 * to the new parent directory.
1244 */
1245 bcopy(ip->de_Name, oldname, 11);
1246 bcopy(toname, ip->de_Name, 11); /* update denode */
1247 dp->de_fndoffset = to_diroffset;
1248 dp->de_fndcnt = to_count;
60233e58 1249 error = createde(ip, dp, NULL, tcnp);
984263bc
MD
1250 if (error) {
1251 bcopy(oldname, ip->de_Name, 11);
fad57d0e 1252 goto done;
984263bc
MD
1253 }
1254 ip->de_refcnt++;
1255 zp->de_fndoffset = from_diroffset;
1256 error = removede(zp, ip);
1257 if (error) {
1258 /* XXX should really panic here, fs is corrupt */
fad57d0e 1259 goto done;
984263bc
MD
1260 }
1261 if (!doingdirectory) {
4afd80f1
MD
1262 error = pcbmap(dp, de_cluster(pmp, to_diroffset),
1263 NULL, &new_dirclust, NULL);
984263bc
MD
1264 if (error) {
1265 /* XXX should really panic here, fs is corrupt */
fad57d0e 1266 goto done;
984263bc 1267 }
3446c007
MD
1268 if (new_dirclust == MSDOSFSROOT)
1269 new_diroffset = to_diroffset;
984263bc 1270 else
3446c007
MD
1271 new_diroffset = to_diroffset & pmp->pm_crbomask;
1272 msdosfs_reinsert(ip, new_dirclust, new_diroffset);
984263bc 1273 }
984263bc
MD
1274 }
1275
1276 /*
1277 * If we moved a directory to a new parent directory, then we must
1278 * fixup the ".." entry in the moved directory.
1279 */
1280 if (doingdirectory && newparent) {
1281 cn = ip->de_StartCluster;
1282 if (cn == MSDOSFSROOT) {
1283 /* this should never happen */
1284 panic("msdosfs_rename(): updating .. in root directory?");
fad57d0e 1285 } else {
4afd80f1 1286 bn = xcntobn(pmp, cn);
fad57d0e 1287 }
54078292 1288 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), pmp->pm_bpcluster, &bp);
984263bc
MD
1289 if (error) {
1290 /* XXX should really panic here, fs is corrupt */
1291 brelse(bp);
fad57d0e 1292 goto done;
984263bc
MD
1293 }
1294 dotdotp = (struct direntry *)bp->b_data + 1;
1295 putushort(dotdotp->deStartCluster, dp->de_StartCluster);
1296 if (FAT32(pmp))
1297 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16);
1298 error = bwrite(bp);
1299 if (error) {
1300 /* XXX should really panic here, fs is corrupt */
fad57d0e 1301 goto done;
984263bc
MD
1302 }
1303 }
1304
fad57d0e
MD
1305 /*
1306 * done case fvp, fdvp, tdvp are locked. ap->a_fvp is refd
1307 */
1308done:
1309 if (doingdirectory)
1310 ip->de_flag &= ~DE_RENAME; /* XXX fvp not locked */
1311 vput(fvp);
1312 if (newparent)
1313 vput(fdvp);
1314 else
1315 vrele(fdvp);
1316 vput(tdvp);
1317 vrele(ap->a_fvp);
1318 return (error);
1319
1320 /*
1321 * 'bad' target: xp governs tvp. tvp and tdvp arel ocked, fdvp and fvp
1322 * are not locked. ip points to fvp's inode which may have DE_RENAME
1323 * set.
1324 */
984263bc
MD
1325bad:
1326 if (xp)
1327 vput(tvp);
1328 vput(tdvp);
1329out:
fad57d0e
MD
1330 /*
1331 * 'out' target: tvp and tdvp have already been cleaned up.
1332 */
1333 if (doingdirectory)
1334 ip->de_flag &= ~DE_RENAME;
984263bc
MD
1335 vrele(fdvp);
1336 vrele(fvp);
1337 return (error);
1338
1339}
1340
1341static struct {
1342 struct direntry dot;
1343 struct direntry dotdot;
1344} dosdirtemplate = {
1345 { ". ", " ", /* the . entry */
1346 ATTR_DIRECTORY, /* file attribute */
1347 0, /* reserved */
1348 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1349 { 0, 0 }, /* access date */
1350 { 0, 0 }, /* high bits of start cluster */
1351 { 210, 4 }, { 210, 4 }, /* modify time & date */
1352 { 0, 0 }, /* startcluster */
1353 { 0, 0, 0, 0 } /* filesize */
1354 },
1355 { ".. ", " ", /* the .. entry */
1356 ATTR_DIRECTORY, /* file attribute */
1357 0, /* reserved */
1358 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1359 { 0, 0 }, /* access date */
1360 { 0, 0 }, /* high bits of start cluster */
1361 { 210, 4 }, { 210, 4 }, /* modify time & date */
1362 { 0, 0 }, /* startcluster */
1363 { 0, 0, 0, 0 } /* filesize */
1364 }
1365};
1366
4625f023
CP
1367/*
1368 * msdosfs_mkdir(struct vnode *a_dvp, struct vnode **a_vpp,
1369 * struct componentname *a_cnp, struct vattr *a_vap)
1370 */
984263bc 1371static int
e62afb5f 1372msdosfs_mkdir(struct vop_old_mkdir_args *ap)
984263bc
MD
1373{
1374 struct componentname *cnp = ap->a_cnp;
1375 struct denode *dep;
1376 struct denode *pdep = VTODE(ap->a_dvp);
1377 struct direntry *denp;
1378 struct msdosfsmount *pmp = pdep->de_pmp;
1379 struct buf *bp;
1380 u_long newcluster, pcl;
1381 int bn;
1382 int error;
1383 struct denode ndirent;
1384 struct timespec ts;
1385
1386 /*
1387 * If this is the root directory and there is no space left we
1388 * can't do anything. This is because the root directory can not
1389 * change size.
1390 */
1391 if (pdep->de_StartCluster == MSDOSFSROOT
1392 && pdep->de_fndoffset >= pdep->de_FileSize) {
1393 error = ENOSPC;
1394 goto bad2;
1395 }
1396
1397 /*
1398 * Allocate a cluster to hold the about to be created directory.
1399 */
1400 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL);
1401 if (error)
1402 goto bad2;
1403
1404 bzero(&ndirent, sizeof(ndirent));
1405 ndirent.de_pmp = pmp;
1406 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1407 getnanotime(&ts);
1408 DETIMES(&ndirent, &ts, &ts, &ts);
1409
1410 /*
1411 * Now fill the cluster with the "." and ".." entries. And write
1412 * the cluster to disk. This way it is there for the parent
1413 * directory to be pointing at if there were a crash.
1414 */
4afd80f1 1415 bn = xcntobn(pmp, newcluster);
984263bc 1416 /* always succeeds */
54078292
MD
1417 bp = getblk(pmp->pm_devvp, de_bntodoff(pmp, bn),
1418 pmp->pm_bpcluster, 0, 0);
984263bc
MD
1419 bzero(bp->b_data, pmp->pm_bpcluster);
1420 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate);
1421 denp = (struct direntry *)bp->b_data;
1422 putushort(denp[0].deStartCluster, newcluster);
1423 putushort(denp[0].deCDate, ndirent.de_CDate);
1424 putushort(denp[0].deCTime, ndirent.de_CTime);
1425 denp[0].deCHundredth = ndirent.de_CHun;
1426 putushort(denp[0].deADate, ndirent.de_ADate);
1427 putushort(denp[0].deMDate, ndirent.de_MDate);
1428 putushort(denp[0].deMTime, ndirent.de_MTime);
1429 pcl = pdep->de_StartCluster;
1430 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1431 pcl = 0;
1432 putushort(denp[1].deStartCluster, pcl);
1433 putushort(denp[1].deCDate, ndirent.de_CDate);
1434 putushort(denp[1].deCTime, ndirent.de_CTime);
1435 denp[1].deCHundredth = ndirent.de_CHun;
1436 putushort(denp[1].deADate, ndirent.de_ADate);
1437 putushort(denp[1].deMDate, ndirent.de_MDate);
1438 putushort(denp[1].deMTime, ndirent.de_MTime);
1439 if (FAT32(pmp)) {
1440 putushort(denp[0].deHighClust, newcluster >> 16);
1441 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16);
1442 }
1443
1444 error = bwrite(bp);
1445 if (error)
1446 goto bad;
1447
1448 /*
1449 * Now build up a directory entry pointing to the newly allocated
1450 * cluster. This will be written to an empty slot in the parent
1451 * directory.
1452 */
984263bc
MD
1453 error = uniqdosname(pdep, cnp, ndirent.de_Name);
1454 if (error)
1455 goto bad;
1456
1457 ndirent.de_Attributes = ATTR_DIRECTORY;
1458 ndirent.de_LowerCase = 0;
1459 ndirent.de_StartCluster = newcluster;
1460 ndirent.de_FileSize = 0;
1461 ndirent.de_dev = pdep->de_dev;
1462 ndirent.de_devvp = pdep->de_devvp;
1463 error = createde(&ndirent, pdep, &dep, cnp);
1464 if (error)
1465 goto bad;
1466 *ap->a_vpp = DETOV(dep);
1467 return (0);
1468
1469bad:
1470 clusterfree(pmp, newcluster, NULL);
1471bad2:
1472 return (error);
1473}
1474
4625f023
CP
1475/*
1476 * msdosfs_rmdir(struct vnode *a_dvp, struct vnode *a_vp,
1477 * struct componentname *a_cnp)
1478 */
984263bc 1479static int
e62afb5f 1480msdosfs_rmdir(struct vop_old_rmdir_args *ap)
984263bc 1481{
dadab5e9
MD
1482 struct vnode *vp = ap->a_vp;
1483 struct vnode *dvp = ap->a_dvp;
dadab5e9 1484 struct denode *ip, *dp;
984263bc
MD
1485 int error;
1486
1487 ip = VTODE(vp);
1488 dp = VTODE(dvp);
1489
1490 /*
1491 * Verify the directory is empty (and valid).
1492 * (Rmdir ".." won't be valid since
1493 * ".." will contain a reference to
1494 * the current directory and thus be
1495 * non-empty.)
1496 */
1497 error = 0;
1498 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) {
1499 error = ENOTEMPTY;
1500 goto out;
1501 }
1502 /*
1503 * Delete the entry from the directory. For dos filesystems this
1504 * gets rid of the directory entry on disk, the in memory copy
1505 * still exists but the de_refcnt is <= 0. This prevents it from
1506 * being found by deget(). When the vput() on dep is done we give
1507 * up access and eventually msdosfs_reclaim() will be called which
1508 * will remove it from the denode cache.
1509 */
1510 error = removede(dp, ip);
1511 if (error)
1512 goto out;
1513 /*
1514 * This is where we decrement the link count in the parent
1515 * directory. Since dos filesystems don't do this we just purge
1516 * the name cache.
1517 */
a11aaa81 1518 vn_unlock(dvp);
984263bc
MD
1519 /*
1520 * Truncate the directory that is being deleted.
1521 */
87de5057 1522 error = detrunc(ip, (u_long)0, IO_SYNC);
984263bc 1523
ca466bae 1524 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
984263bc
MD
1525out:
1526 return (error);
1527}
1528
1529/*
1530 * DOS filesystems don't know what symlinks are.
4625f023
CP
1531 *
1532 * msdosfs_symlink(struct vnode *a_dvp, struct vnode **a_vpp,
1533 * struct componentname *a_cnp, struct vattr *a_vap,
1534 * char *a_target)
984263bc
MD
1535 */
1536static int
e62afb5f 1537msdosfs_symlink(struct vop_old_symlink_args *ap)
984263bc
MD
1538{
1539 return (EOPNOTSUPP);
1540}
1541
4625f023
CP
1542/*
1543 * msdosfs_readdir(struct vnode *a_vp, struct uio *a_uio,
1544 * struct ucred *a_cred, int *a_eofflag, int *a_ncookies,
84009d92 1545 * off_t **a_cookies)
4625f023 1546 */
984263bc 1547static int
4625f023 1548msdosfs_readdir(struct vop_readdir_args *ap)
984263bc
MD
1549{
1550 int error = 0;
1551 int diff;
1552 long n;
1553 int blsize;
1554 long on;
1555 u_long cn;
984263bc
MD
1556 u_long dirsperblk;
1557 long bias = 0;
1558 daddr_t bn, lbn;
1559 struct buf *bp;
885ecb13
MD
1560 struct denode *dep;
1561 struct msdosfsmount *pmp;
984263bc 1562 struct direntry *dentp;
984263bc 1563 struct uio *uio = ap->a_uio;
84009d92 1564 off_t *cookies = NULL;
984263bc
MD
1565 int ncookies = 0;
1566 off_t offset, off;
1567 int chksum = -1;
1754e0da
JS
1568 ino_t d_ino;
1569 uint16_t d_namlen;
1570 uint8_t d_type;
1571 char *d_name_storage = NULL;
1572 char *d_name;
984263bc 1573
885ecb13
MD
1574 if ((error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY)) != 0)
1575 return (error);
1576
1577 dep = VTODE(ap->a_vp);
1578 pmp = dep->de_pmp;
1579
984263bc 1580#ifdef MSDOSFS_DEBUG
086c1d7e 1581 kprintf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
984263bc
MD
1582 ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
1583#endif
1584
1585 /*
1586 * msdosfs_readdir() won't operate properly on regular files since
1587 * it does i/o only with the the filesystem vnode, and hence can
1588 * retrieve the wrong block from the buffer cache for a plain file.
1589 * So, fail attempts to readdir() on a plain file.
1590 */
885ecb13
MD
1591 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) {
1592 error = ENOTDIR;
1593 goto done;
1594 }
984263bc
MD
1595
1596 /*
984263bc
MD
1597 * If the user buffer is smaller than the size of one dos directory
1598 * entry or the file offset is not a multiple of the size of a
1599 * directory entry, then we fail the read.
1600 */
1601 off = offset = uio->uio_offset;
1602 if (uio->uio_resid < sizeof(struct direntry) ||
885ecb13
MD
1603 (offset & (sizeof(struct direntry) - 1))) {
1604 error = EINVAL;
1605 goto done;
1606 }
984263bc
MD
1607
1608 if (ap->a_ncookies) {
fb0466c9
MD
1609 ncookies = uio->uio_resid / 16 + 1;
1610 if (ncookies > 1024)
1611 ncookies = 1024;
84009d92 1612 MALLOC(cookies, off_t *, ncookies * sizeof(off_t), M_TEMP,
984263bc
MD
1613 M_WAITOK);
1614 *ap->a_cookies = cookies;
1615 *ap->a_ncookies = ncookies;
1616 }
1617
1618 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1619
1620 /*
1621 * If they are reading from the root directory then, we simulate
1622 * the . and .. entries since these don't exist in the root
1623 * directory. We also set the offset bias to make up for having to
1624 * simulate these entries. By this I mean that at file offset 64 we
1625 * read the first entry in the root directory that lives on disk.
1626 */
1627 if (dep->de_StartCluster == MSDOSFSROOT
1628 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
1629#if 0
086c1d7e 1630 kprintf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n",
984263bc
MD
1631 offset);
1632#endif
1633 bias = 2 * sizeof(struct direntry);
1634 if (offset < bias) {
1754e0da
JS
1635 for (n = (int)offset / sizeof(struct direntry); n < 2;
1636 n++) {
984263bc 1637 if (FAT32(pmp))
4afd80f1 1638 d_ino = xcntobn(pmp, pmp->pm_rootdirblk)
1754e0da 1639 * dirsperblk;
984263bc 1640 else
1754e0da
JS
1641 d_ino = 1;
1642 d_type = DT_DIR;
1643 if (n == 0) {
1644 d_namlen = 1;
1645 d_name = ".";
1646 } else /* if (n == 1) */{
1647 d_namlen = 2;
1648 d_name = "..";
984263bc 1649 }
1754e0da
JS
1650 if (vop_write_dirent(&error, uio, d_ino, d_type,
1651 d_namlen, d_name))
984263bc 1652 goto out;
984263bc
MD
1653 if (error)
1654 goto out;
1655 offset += sizeof(struct direntry);
1656 off = offset;
1657 if (cookies) {
1658 *cookies++ = offset;
1659 if (--ncookies <= 0)
1660 goto out;
1661 }
1662 }
1663 }
1664 }
1665
efda3bd0 1666 d_name_storage = kmalloc(WIN_MAXLEN, M_TEMP, M_WAITOK);
984263bc 1667 off = offset;
1754e0da 1668
984263bc 1669 while (uio->uio_resid > 0) {
4afd80f1 1670 lbn = de_off2cn(pmp, offset - bias);
984263bc 1671 on = (offset - bias) & pmp->pm_crbomask;
e54488bb 1672 n = szmin(pmp->pm_bpcluster - on, uio->uio_resid);
984263bc
MD
1673 diff = dep->de_FileSize - (offset - bias);
1674 if (diff <= 0)
1675 break;
1676 n = min(n, diff);
1677 error = pcbmap(dep, lbn, &bn, &cn, &blsize);
1678 if (error)
1679 break;
54078292 1680 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, &bp);
984263bc
MD
1681 if (error) {
1682 brelse(bp);
efda3bd0 1683 kfree(d_name_storage, M_TEMP);
885ecb13 1684 goto done;
984263bc
MD
1685 }
1686 n = min(n, blsize - bp->b_resid);
1687
1688 /*
1689 * Convert from dos directory entries to fs-independent
1690 * directory entries.
1691 */
1692 for (dentp = (struct direntry *)(bp->b_data + on);
1693 (char *)dentp < bp->b_data + on + n;
1694 dentp++, offset += sizeof(struct direntry)) {
1695#if 0
086c1d7e 1696 kprintf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
984263bc
MD
1697 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
1698#endif
1754e0da 1699 d_name = d_name_storage;
984263bc
MD
1700 /*
1701 * If this is an unused entry, we can stop.
1702 */
1703 if (dentp->deName[0] == SLOT_EMPTY) {
1704 brelse(bp);
1705 goto out;
1706 }
1707 /*
1708 * Skip deleted entries.
1709 */
1710 if (dentp->deName[0] == SLOT_DELETED) {
1711 chksum = -1;
1712 continue;
1713 }
1714
1715 /*
1716 * Handle Win95 long directory entries
1717 */
1718 if (dentp->deAttributes == ATTR_WIN95) {
1719 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
1720 continue;
1721 chksum = win2unixfn((struct winentry *)dentp,
1754e0da 1722 d_name, &d_namlen, chksum,
984263bc
MD
1723 pmp->pm_flags & MSDOSFSMNT_U2WTABLE,
1724 pmp->pm_u2w);
1725 continue;
1726 }
1727
1728 /*
1729 * Skip volume labels
1730 */
1731 if (dentp->deAttributes & ATTR_VOLUME) {
1732 chksum = -1;
1733 continue;
1734 }
1735 /*
1754e0da 1736 * This computation of d_ino must match
984263bc
MD
1737 * the computation of va_fileid in
1738 * msdosfs_getattr.
1739 */
1740 if (dentp->deAttributes & ATTR_DIRECTORY) {
1754e0da 1741 d_ino = getushort(dentp->deStartCluster);
984263bc 1742 if (FAT32(pmp))
1754e0da 1743 d_ino |= getushort(dentp->deHighClust) << 16;
984263bc 1744 /* if this is the root directory */
1754e0da 1745 if (d_ino != MSDOSFSROOT)
4afd80f1 1746 d_ino = xcntobn(pmp, d_ino) * dirsperblk;
1754e0da 1747 else if (FAT32(pmp))
4afd80f1 1748 d_ino = xcntobn(pmp, pmp->pm_rootdirblk)
1754e0da 1749 * dirsperblk;
984263bc 1750 else
1754e0da
JS
1751 d_ino = 1;
1752 d_type = DT_DIR;
984263bc 1753 } else {
1754e0da
JS
1754 d_ino = offset / sizeof(struct direntry);
1755 d_type = DT_REG;
984263bc 1756 }
1754e0da
JS
1757 if (chksum != winChksum(dentp->deName)) {
1758 d_namlen = dos2unixfn(dentp->deName,
1759 (u_char *)d_name,
984263bc
MD
1760 dentp->deLowerCase |
1761 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ?
1762 (LCASE_BASE | LCASE_EXT) : 0),
1763 pmp->pm_flags & MSDOSFSMNT_U2WTABLE,
1764 pmp->pm_d2u,
1765 pmp->pm_flags & MSDOSFSMNT_ULTABLE,
1766 pmp->pm_ul);
1754e0da 1767 }
984263bc 1768 chksum = -1;
1754e0da
JS
1769 if (vop_write_dirent(&error, uio, d_ino, d_type,
1770 d_namlen, d_name)) {
984263bc
MD
1771 brelse(bp);
1772 goto out;
1773 }
984263bc
MD
1774 if (error) {
1775 brelse(bp);
1776 goto out;
1777 }
1754e0da 1778
984263bc
MD
1779 if (cookies) {
1780 *cookies++ = offset + sizeof(struct direntry);
1781 if (--ncookies <= 0) {
1782 brelse(bp);
1783 goto out;
1784 }
1785 }
1786 off = offset + sizeof(struct direntry);
1787 }
1788 brelse(bp);
1789 }
1790out:
1754e0da 1791 if (d_name_storage != NULL)
efda3bd0 1792 kfree(d_name_storage, M_TEMP);
1754e0da 1793
984263bc
MD
1794 /* Subtract unused cookies */
1795 if (ap->a_ncookies)
1796 *ap->a_ncookies -= ncookies;
1797
1798 uio->uio_offset = off;
1799
1800 /*
1801 * Set the eofflag (NFS uses it)
1802 */
1803 if (ap->a_eofflag) {
1804 if (dep->de_FileSize - (offset - bias) <= 0)
1805 *ap->a_eofflag = 1;
1806 else
1807 *ap->a_eofflag = 0;
1808 }
885ecb13
MD
1809done:
1810 vn_unlock(ap->a_vp);
984263bc
MD
1811 return (error);
1812}
1813
1814/*
1815 * vp - address of vnode file the file
1816 * bn - which cluster we are interested in mapping to a filesystem block number.
1817 * vpp - returns the vnode for the block special file holding the filesystem
1818 * containing the file of interest
1819 * bnp - address of where to return the filesystem relative block number
4625f023 1820 *
08daea96 1821 * msdosfs_bmap(struct vnode *a_vp, off_t a_loffset,
54078292 1822 * off_t *a_doffsetp, int *a_runp, int *a_runb)
984263bc
MD
1823 */
1824static int
4625f023 1825msdosfs_bmap(struct vop_bmap_args *ap)
984263bc
MD
1826{
1827 struct denode *dep = VTODE(ap->a_vp);
54078292
MD
1828 struct msdosfsmount *pmp = dep->de_pmp;
1829 daddr_t lbn;
1830 daddr_t dbn;
1831 int error;
984263bc 1832
54078292 1833 if (ap->a_doffsetp == NULL)
984263bc
MD
1834 return (0);
1835 if (ap->a_runp) {
1836 /*
1837 * Sequential clusters should be counted here.
1838 */
1839 *ap->a_runp = 0;
1840 }
1841 if (ap->a_runb) {
1842 *ap->a_runb = 0;
1843 }
4afd80f1
MD
1844 KKASSERT(((int)ap->a_loffset & ((1 << pmp->pm_cnshift) - 1)) == 0);
1845 lbn = de_off2cn(pmp, ap->a_loffset);
1846 error = pcbmap(dep, lbn, &dbn, NULL, NULL);
54078292
MD
1847 if (error || dbn == (daddr_t)-1) {
1848 *ap->a_doffsetp = NOOFFSET;
1849 } else {
4afd80f1 1850 *ap->a_doffsetp = de_bntodoff(pmp, dbn);
54078292
MD
1851 }
1852 return (error);
984263bc
MD
1853}
1854
4625f023 1855/*
81b5c339 1856 * msdosfs_strategy(struct vnode *a_vp, struct bio *a_bio)
4625f023 1857 */
984263bc 1858static int
4625f023 1859msdosfs_strategy(struct vop_strategy_args *ap)
984263bc 1860{
81b5c339
MD
1861 struct bio *bio = ap->a_bio;
1862 struct bio *nbio;
1863 struct buf *bp = bio->bio_buf;
1864 struct vnode *vp = ap->a_vp;
1865 struct denode *dep = VTODE(vp);
54078292 1866 struct msdosfsmount *pmp = dep->de_pmp;
984263bc 1867 int error = 0;
54078292 1868 daddr_t dblkno;
984263bc 1869
81b5c339 1870 if (vp->v_type == VBLK || vp->v_type == VCHR)
984263bc
MD
1871 panic("msdosfs_strategy: spec");
1872 /*
1873 * If we don't already know the filesystem relative block number
1874 * then get it using pcbmap(). If pcbmap() returns the block
1875 * number as -1 then we've got a hole in the file. DOS filesystems
1876 * don't allow files with holes, so we shouldn't ever see this.
1877 */
81b5c339 1878 nbio = push_bio(bio);
54078292 1879 if (nbio->bio_offset == NOOFFSET) {
4afd80f1
MD
1880 error = pcbmap(dep, de_off2cn(pmp, bio->bio_offset),
1881 &dblkno, NULL, NULL);
984263bc
MD
1882 if (error) {
1883 bp->b_error = error;
1884 bp->b_flags |= B_ERROR;
81b5c339
MD
1885 /* I/O was never started on nbio, must biodone(bio) */
1886 biodone(bio);
984263bc
MD
1887 return (error);
1888 }
54078292
MD
1889 if (dblkno == (daddr_t)-1) {
1890 nbio->bio_offset = NOOFFSET;
984263bc 1891 vfs_bio_clrbuf(bp);
54078292 1892 } else {
4afd80f1 1893 nbio->bio_offset = de_bntodoff(pmp, dblkno);
54078292 1894 }
984263bc 1895 }
54078292 1896 if (nbio->bio_offset == NOOFFSET) {
81b5c339
MD
1897 /* I/O was never started on nbio, must biodone(bio) */
1898 biodone(bio);
984263bc
MD
1899 return (0);
1900 }
1901 /*
1902 * Read/write the block from/to the disk that contains the desired
1903 * file block.
1904 */
81b5c339 1905 vn_strategy(dep->de_devvp, nbio);
984263bc
MD
1906 return (0);
1907}
1908
4625f023
CP
1909/*
1910 * msdosfs_print(struct vnode *vp)
1911 */
984263bc 1912static int
4625f023 1913msdosfs_print(struct vop_print_args *ap)
984263bc
MD
1914{
1915 struct denode *dep = VTODE(ap->a_vp);
1916
086c1d7e 1917 kprintf(
984263bc
MD
1918 "tag VT_MSDOSFS, startcluster %lu, dircluster %lu, diroffset %lu ",
1919 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
086c1d7e 1920 kprintf(" dev %d, %d", major(dep->de_dev), minor(dep->de_dev));
3446c007 1921 lockmgr_printinfo(&ap->a_vp->v_lock);
086c1d7e 1922 kprintf("\n");
984263bc
MD
1923 return (0);
1924}
1925
4625f023
CP
1926/*
1927 * msdosfs_pathconf(struct vnode *a_vp, int a_name, int *a_retval)
1928 */
984263bc 1929static int
4625f023 1930msdosfs_pathconf(struct vop_pathconf_args *ap)
984263bc
MD
1931{
1932 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp;
1933
1934 switch (ap->a_name) {
1935 case _PC_LINK_MAX:
1936 *ap->a_retval = 1;
1937 return (0);
1938 case _PC_NAME_MAX:
1939 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12;
1940 return (0);
1941 case _PC_PATH_MAX:
1942 *ap->a_retval = PATH_MAX;
1943 return (0);
1944 case _PC_CHOWN_RESTRICTED:
1945 *ap->a_retval = 1;
1946 return (0);
1947 case _PC_NO_TRUNC:
1948 *ap->a_retval = 0;
1949 return (0);
1950 default:
1951 return (EINVAL);
1952 }
1953 /* NOTREACHED */
1954}
1955
984263bc 1956/* Global vfs data structures for msdosfs */
66a1ddf5
MD
1957struct vop_ops msdosfs_vnode_vops = {
1958 .vop_default = vop_defaultop,
1959 .vop_access = msdosfs_access,
1960 .vop_bmap = msdosfs_bmap,
1961 .vop_old_lookup = msdosfs_lookup,
1962 .vop_open = msdosfs_open,
1963 .vop_close = msdosfs_close,
1964 .vop_old_create = msdosfs_create,
1965 .vop_fsync = msdosfs_fsync,
1966 .vop_getattr = msdosfs_getattr,
1967 .vop_inactive = msdosfs_inactive,
66a1ddf5 1968 .vop_old_link = msdosfs_link,
66a1ddf5
MD
1969 .vop_old_mkdir = msdosfs_mkdir,
1970 .vop_old_mknod = msdosfs_mknod,
1971 .vop_pathconf = msdosfs_pathconf,
1972 .vop_print = msdosfs_print,
1973 .vop_read = msdosfs_read,
1974 .vop_readdir = msdosfs_readdir,
1975 .vop_reclaim = msdosfs_reclaim,
1976 .vop_old_remove = msdosfs_remove,
1977 .vop_old_rename = msdosfs_rename,
1978 .vop_old_rmdir = msdosfs_rmdir,
1979 .vop_setattr = msdosfs_setattr,
1980 .vop_strategy = msdosfs_strategy,
1981 .vop_old_symlink = msdosfs_symlink,
66a1ddf5 1982 .vop_write = msdosfs_write,
1787385d
MD
1983 .vop_getpages = vop_stdgetpages,
1984 .vop_putpages = vop_stdputpages
984263bc 1985};