1 /* $FreeBSD: src/sys/msdosfs/msdosfs_vnops.c,v 1.95.2.4 2003/06/13 15:05:47 trhodes Exp $ */
2 /* $DragonFly: src/sys/vfs/msdosfs/msdosfs_vnops.c,v 1.54 2007/11/20 21:03:50 dillon Exp $ */
3 /* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $ */
6 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
7 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
9 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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.
37 * Written by Paul Popelka (paulp@uts.amdahl.com)
39 * You can do anything you want with this software, just don't say you wrote
40 * it, and don't remove this notice.
42 * This software is provided "as is".
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.
52 #include <sys/param.h>
53 #include <sys/systm.h>
54 #include <sys/resourcevar.h> /* defines plimit structure in proc struct */
55 #include <sys/kernel.h>
59 #include <sys/namei.h>
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>
68 #include <vm/vm_extern.h>
69 #include <vm/vm_zone.h>
70 #include <vm/vnode_pager.h>
77 #include "msdosfsmount.h"
80 #define DOS_FILESIZE_MAX 0xffffffff
83 * Prototypes for MSDOSFS vnode operations
85 static int msdosfs_create (struct vop_old_create_args
*);
86 static int msdosfs_mknod (struct vop_old_mknod_args
*);
87 static int msdosfs_open (struct vop_open_args
*);
88 static int msdosfs_close (struct vop_close_args
*);
89 static int msdosfs_access (struct vop_access_args
*);
90 static int msdosfs_getattr (struct vop_getattr_args
*);
91 static int msdosfs_setattr (struct vop_setattr_args
*);
92 static int msdosfs_read (struct vop_read_args
*);
93 static int msdosfs_write (struct vop_write_args
*);
94 static int msdosfs_fsync (struct vop_fsync_args
*);
95 static int msdosfs_remove (struct vop_old_remove_args
*);
96 static int msdosfs_link (struct vop_old_link_args
*);
97 static int msdosfs_rename (struct vop_old_rename_args
*);
98 static int msdosfs_mkdir (struct vop_old_mkdir_args
*);
99 static int msdosfs_rmdir (struct vop_old_rmdir_args
*);
100 static int msdosfs_symlink (struct vop_old_symlink_args
*);
101 static int msdosfs_readdir (struct vop_readdir_args
*);
102 static int msdosfs_bmap (struct vop_bmap_args
*);
103 static int msdosfs_strategy (struct vop_strategy_args
*);
104 static int msdosfs_print (struct vop_print_args
*);
105 static int msdosfs_pathconf (struct vop_pathconf_args
*ap
);
108 * Some general notes:
110 * In the ufs filesystem the inodes, superblocks, and indirect blocks are
111 * read/written using the vnode for the filesystem. Blocks that represent
112 * the contents of a file are read/written using the vnode for the file
113 * (including directories when they are read/written as files). This
114 * presents problems for the dos filesystem because data that should be in
115 * an inode (if dos had them) resides in the directory itself. Since we
116 * must update directory entries without the benefit of having the vnode
117 * for the directory we must use the vnode for the filesystem. This means
118 * that when a directory is actually read/written (via read, write, or
119 * readdir, or seek) we must use the vnode for the filesystem instead of
120 * the vnode for the directory as would happen in ufs. This is to insure we
121 * retreive the correct block from the buffer cache since the hash value is
122 * based upon the vnode address and the desired block number.
126 * Create a regular file. On entry the directory to contain the file being
127 * created is locked. We must release before we return.
129 * msdosfs_create(struct vnode *a_dvp, struct vnode **a_vpp,
130 * struct componentname *a_cnp, struct vattr *a_vap)
133 msdosfs_create(struct vop_old_create_args
*ap
)
135 struct componentname
*cnp
= ap
->a_cnp
;
136 struct denode ndirent
;
138 struct denode
*pdep
= VTODE(ap
->a_dvp
);
143 kprintf("msdosfs_create(cnp %p, vap %p\n", cnp
, ap
->a_vap
);
147 * If this is the root directory and there is no space left we
148 * can't do anything. This is because the root directory can not
151 if (pdep
->de_StartCluster
== MSDOSFSROOT
152 && pdep
->de_fndoffset
>= pdep
->de_FileSize
) {
158 * Create a directory entry for the file, then call createde() to
159 * have it installed. NOTE: DOS files are always executable. We
160 * use the absence of the owner write bit to make the file
163 bzero(&ndirent
, sizeof(ndirent
));
164 error
= uniqdosname(pdep
, cnp
, ndirent
.de_Name
);
168 ndirent
.de_Attributes
= (ap
->a_vap
->va_mode
& VWRITE
) ?
169 ATTR_ARCHIVE
: ATTR_ARCHIVE
| ATTR_READONLY
;
170 ndirent
.de_LowerCase
= 0;
171 ndirent
.de_StartCluster
= 0;
172 ndirent
.de_FileSize
= 0;
173 ndirent
.de_dev
= pdep
->de_dev
;
174 ndirent
.de_devvp
= pdep
->de_devvp
;
175 ndirent
.de_pmp
= pdep
->de_pmp
;
176 ndirent
.de_flag
= DE_ACCESS
| DE_CREATE
| DE_UPDATE
;
178 DETIMES(&ndirent
, &ts
, &ts
, &ts
);
179 error
= createde(&ndirent
, pdep
, &dep
, cnp
);
182 *ap
->a_vpp
= DETOV(dep
);
190 * msdosfs_mknod(struct vnode *a_dvp, struct vnode **a_vpp,
191 * struct componentname *a_cnp, struct vattr *a_vap)
194 msdosfs_mknod(struct vop_old_mknod_args
*ap
)
196 switch (ap
->a_vap
->va_type
) {
198 return (msdosfs_mkdir((struct vop_old_mkdir_args
*)ap
));
202 return (msdosfs_create((struct vop_old_create_args
*)ap
));
212 * msdosfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
216 msdosfs_open(struct vop_open_args
*ap
)
218 return(vop_stdopen(ap
));
222 * msdosfs_close(struct vnode *a_vp, int a_fflag)
225 msdosfs_close(struct vop_close_args
*ap
)
227 struct vnode
*vp
= ap
->a_vp
;
228 struct denode
*dep
= VTODE(vp
);
231 if (vp
->v_sysref
.refcnt
> 1) {
233 DETIMES(dep
, &ts
, &ts
, &ts
);
235 return (vop_stdclose(ap
));
239 * msdosfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred)
242 msdosfs_access(struct vop_access_args
*ap
)
244 struct vnode
*vp
= ap
->a_vp
;
245 struct denode
*dep
= VTODE(ap
->a_vp
);
246 struct msdosfsmount
*pmp
= dep
->de_pmp
;
247 struct ucred
*cred
= ap
->a_cred
;
248 mode_t mask
, file_mode
, mode
= ap
->a_mode
;
252 file_mode
= (S_IXUSR
|S_IXGRP
|S_IXOTH
) | (S_IRUSR
|S_IRGRP
|S_IROTH
) |
253 ((dep
->de_Attributes
& ATTR_READONLY
) ? 0 : (S_IWUSR
|S_IWGRP
|S_IWOTH
));
254 file_mode
&= pmp
->pm_mask
;
257 * Disallow write attempts on read-only file systems;
258 * unless the file is a socket, fifo, or a block or
259 * character device resident on the file system.
262 switch (vp
->v_type
) {
266 if (vp
->v_mount
->mnt_flag
& MNT_RDONLY
)
274 /* User id 0 always gets access. */
275 if (cred
->cr_uid
== 0)
280 /* Otherwise, check the owner. */
281 if (cred
->cr_uid
== pmp
->pm_uid
) {
288 return (file_mode
& mask
) == mask
? 0 : EACCES
;
291 /* Otherwise, check the groups. */
292 for (i
= 0, gp
= cred
->cr_groups
; i
< cred
->cr_ngroups
; i
++, gp
++)
293 if (pmp
->pm_gid
== *gp
) {
300 return (file_mode
& mask
) == mask
? 0 : EACCES
;
303 /* Otherwise, check everyone else. */
310 return (file_mode
& mask
) == mask
? 0 : EACCES
;
314 * msdosfs_getattr(struct vnode *a_vp, struct vattr *a_vap)
317 msdosfs_getattr(struct vop_getattr_args
*ap
)
319 struct denode
*dep
= VTODE(ap
->a_vp
);
320 struct msdosfsmount
*pmp
= dep
->de_pmp
;
321 struct vattr
*vap
= ap
->a_vap
;
324 u_long dirsperblk
= pmp
->pm_BytesPerSec
/ sizeof(struct direntry
);
328 DETIMES(dep
, &ts
, &ts
, &ts
);
329 vap
->va_fsid
= dev2udev(dep
->de_dev
);
331 * The following computation of the fileid must be the same as that
332 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
335 if (dep
->de_Attributes
& ATTR_DIRECTORY
) {
336 fileid
= xcntobn(pmp
, dep
->de_StartCluster
) * dirsperblk
;
337 if (dep
->de_StartCluster
== MSDOSFSROOT
)
340 fileid
= xcntobn(pmp
, dep
->de_dirclust
) * dirsperblk
;
341 if (dep
->de_dirclust
== MSDOSFSROOT
)
342 fileid
= roottobn(pmp
, 0) * dirsperblk
;
343 fileid
+= dep
->de_diroffset
/ sizeof(struct direntry
);
345 vap
->va_fileid
= fileid
;
346 if ((dep
->de_Attributes
& ATTR_READONLY
) == 0)
347 mode
= S_IRWXU
|S_IRWXG
|S_IRWXO
;
349 mode
= S_IRUSR
|S_IXUSR
|S_IRGRP
|S_IXGRP
|S_IROTH
|S_IXOTH
;
350 vap
->va_mode
= mode
& pmp
->pm_mask
;
351 vap
->va_uid
= pmp
->pm_uid
;
352 vap
->va_gid
= pmp
->pm_gid
;
354 vap
->va_rmajor
= VNOVAL
;
355 vap
->va_rminor
= VNOVAL
;
356 vap
->va_size
= dep
->de_FileSize
;
357 dos2unixtime(dep
->de_MDate
, dep
->de_MTime
, 0, &vap
->va_mtime
);
358 if (pmp
->pm_flags
& MSDOSFSMNT_LONGNAME
) {
359 dos2unixtime(dep
->de_ADate
, 0, 0, &vap
->va_atime
);
360 dos2unixtime(dep
->de_CDate
, dep
->de_CTime
, dep
->de_CHun
, &vap
->va_ctime
);
362 vap
->va_atime
= vap
->va_mtime
;
363 vap
->va_ctime
= vap
->va_mtime
;
366 if ((dep
->de_Attributes
& ATTR_ARCHIVE
) == 0)
367 vap
->va_flags
|= SF_ARCHIVED
;
369 vap
->va_blocksize
= pmp
->pm_bpcluster
;
371 (dep
->de_FileSize
+ pmp
->pm_crbomask
) & ~pmp
->pm_crbomask
;
372 vap
->va_type
= ap
->a_vp
->v_type
;
373 vap
->va_filerev
= dep
->de_modrev
;
378 * msdosfs_setattr(struct vnode *a_vp, struct vattr *a_vap,
379 * struct ucred *a_cred)
382 msdosfs_setattr(struct vop_setattr_args
*ap
)
384 struct vnode
*vp
= ap
->a_vp
;
385 struct denode
*dep
= VTODE(ap
->a_vp
);
386 struct msdosfsmount
*pmp
= dep
->de_pmp
;
387 struct vattr
*vap
= ap
->a_vap
;
388 struct ucred
*cred
= ap
->a_cred
;
392 kprintf("msdosfs_setattr(): vp %p, vap %p, cred %p\n",
393 ap
->a_vp
, vap
, cred
);
397 * Check for unsettable attributes.
399 if ((vap
->va_type
!= VNON
) || (vap
->va_nlink
!= VNOVAL
) ||
400 (vap
->va_fsid
!= VNOVAL
) || (vap
->va_fileid
!= VNOVAL
) ||
401 (vap
->va_blocksize
!= VNOVAL
) || (vap
->va_rmajor
!= VNOVAL
) ||
402 (vap
->va_bytes
!= VNOVAL
) || (vap
->va_gen
!= VNOVAL
)) {
404 kprintf("msdosfs_setattr(): returning EINVAL\n");
405 kprintf(" va_type %d, va_nlink %llx, va_fsid %x, va_fileid %llx\n",
406 vap
->va_type
, vap
->va_nlink
, vap
->va_fsid
, vap
->va_fileid
);
407 kprintf(" va_blocksize %lx, va_rmajor %x, va_bytes %qx, va_gen %llx\n",
408 vap
->va_blocksize
, vap
->va_rmajor
, vap
->va_bytes
, vap
->va_gen
);
409 kprintf(" va_uid %x, va_gid %x\n",
410 vap
->va_uid
, vap
->va_gid
);
414 if (vap
->va_flags
!= VNOVAL
) {
415 if (vp
->v_mount
->mnt_flag
& MNT_RDONLY
)
417 if (cred
->cr_uid
!= pmp
->pm_uid
&&
418 (error
= suser_cred(cred
, PRISON_ROOT
)))
421 * We are very inconsistent about handling unsupported
422 * attributes. We ignored the access time and the
423 * read and execute bits. We were strict for the other
426 * Here we are strict, stricter than ufs in not allowing
427 * users to attempt to set SF_SETTABLE bits or anyone to
428 * set unsupported bits. However, we ignore attempts to
429 * set ATTR_ARCHIVE for directories `cp -pr' from a more
430 * sensible file system attempts it a lot.
432 if (cred
->cr_uid
!= 0) {
433 if (vap
->va_flags
& SF_SETTABLE
)
436 if (vap
->va_flags
& ~SF_ARCHIVED
)
438 if (vap
->va_flags
& SF_ARCHIVED
)
439 dep
->de_Attributes
&= ~ATTR_ARCHIVE
;
440 else if (!(dep
->de_Attributes
& ATTR_DIRECTORY
))
441 dep
->de_Attributes
|= ATTR_ARCHIVE
;
442 dep
->de_flag
|= DE_MODIFIED
;
445 if (vap
->va_uid
!= (uid_t
)VNOVAL
|| vap
->va_gid
!= (gid_t
)VNOVAL
) {
449 if (vp
->v_mount
->mnt_flag
& MNT_RDONLY
)
452 if (uid
== (uid_t
)VNOVAL
)
455 if (gid
== (gid_t
)VNOVAL
)
457 if ((cred
->cr_uid
!= pmp
->pm_uid
|| uid
!= pmp
->pm_uid
||
458 (gid
!= pmp
->pm_gid
&& !groupmember(gid
, cred
))) &&
459 (error
= suser_cred(cred
, PRISON_ROOT
)))
461 if (uid
!= pmp
->pm_uid
|| gid
!= pmp
->pm_gid
)
465 if (vap
->va_size
!= VNOVAL
) {
467 * Disallow write attempts on read-only file systems;
468 * unless the file is a socket, fifo, or a block or
469 * character device resident on the file system.
471 switch (vp
->v_type
) {
477 if (vp
->v_mount
->mnt_flag
& MNT_RDONLY
)
483 error
= detrunc(dep
, vap
->va_size
, 0);
487 if (vap
->va_atime
.tv_sec
!= VNOVAL
|| vap
->va_mtime
.tv_sec
!= VNOVAL
) {
488 if (vp
->v_mount
->mnt_flag
& MNT_RDONLY
)
490 if (cred
->cr_uid
!= pmp
->pm_uid
&&
491 (error
= suser_cred(cred
, PRISON_ROOT
)) &&
492 ((vap
->va_vaflags
& VA_UTIMES_NULL
) == 0 ||
493 (error
= VOP_ACCESS(ap
->a_vp
, VWRITE
, cred
))))
495 if (vp
->v_type
!= VDIR
) {
496 if ((pmp
->pm_flags
& MSDOSFSMNT_NOWIN95
) == 0 &&
497 vap
->va_atime
.tv_sec
!= VNOVAL
) {
498 dep
->de_flag
&= ~DE_ACCESS
;
499 unix2dostime(&vap
->va_atime
, &dep
->de_ADate
,
502 if (vap
->va_mtime
.tv_sec
!= VNOVAL
) {
503 dep
->de_flag
&= ~DE_UPDATE
;
504 unix2dostime(&vap
->va_mtime
, &dep
->de_MDate
,
505 &dep
->de_MTime
, NULL
);
507 dep
->de_Attributes
|= ATTR_ARCHIVE
;
508 dep
->de_flag
|= DE_MODIFIED
;
512 * DOS files only have the ability to have their writability
513 * attribute set, so we use the owner write bit to set the readonly
516 if (vap
->va_mode
!= (mode_t
)VNOVAL
) {
517 if (vp
->v_mount
->mnt_flag
& MNT_RDONLY
)
519 if (cred
->cr_uid
!= pmp
->pm_uid
&&
520 (error
= suser_cred(cred
, PRISON_ROOT
)))
522 if (vp
->v_type
!= VDIR
) {
523 /* We ignore the read and execute bits. */
524 if (vap
->va_mode
& VWRITE
)
525 dep
->de_Attributes
&= ~ATTR_READONLY
;
527 dep
->de_Attributes
|= ATTR_READONLY
;
528 dep
->de_Attributes
|= ATTR_ARCHIVE
;
529 dep
->de_flag
|= DE_MODIFIED
;
532 return (deupdat(dep
, 1));
536 * msdosfs_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
537 * struct ucred *a_cred)
540 msdosfs_read(struct vop_read_args
*ap
)
556 struct vnode
*vp
= ap
->a_vp
;
557 struct denode
*dep
= VTODE(vp
);
558 struct msdosfsmount
*pmp
= dep
->de_pmp
;
559 struct uio
*uio
= ap
->a_uio
;
561 if (uio
->uio_offset
< 0)
564 if ((uoff_t
)uio
->uio_offset
> DOS_FILESIZE_MAX
)
567 * If they didn't ask for any data, then we are done.
569 orig_resid
= uio
->uio_resid
;
573 seqcount
= ap
->a_ioflag
>> IO_SEQSHIFT
;
575 isadir
= dep
->de_Attributes
& ATTR_DIRECTORY
;
577 if (uio
->uio_offset
>= dep
->de_FileSize
)
581 * note: lbn is a cluster number, not a device block number.
583 lbn
= de_off2cn(pmp
, uio
->uio_offset
);
584 loffset
= de_cn2doff(pmp
, lbn
);
587 * If we are operating on a directory file then be sure to
588 * do i/o with the vnode for the filesystem instead of the
589 * vnode for the directory.
593 * convert cluster # to block #. lbn is a
594 * device block number after this.
596 error
= pcbmap(dep
, lbn
, &lbn
, NULL
, &blsize
);
597 loffset
= de_bntodoff(pmp
, lbn
);
598 if (error
== E2BIG
) {
603 error
= bread(pmp
->pm_devvp
, loffset
, blsize
, &bp
);
605 blsize
= pmp
->pm_bpcluster
;
607 raoffset
= de_cn2doff(pmp
, rablock
);
609 raoffset
< dep
->de_FileSize
) {
610 rasize
= pmp
->pm_bpcluster
;
611 error
= breadn(vp
, loffset
, blsize
,
612 &raoffset
, &rasize
, 1, &bp
);
614 error
= bread(vp
, loffset
, blsize
, &bp
);
621 on
= uio
->uio_offset
& pmp
->pm_crbomask
;
622 diff
= pmp
->pm_bpcluster
- on
;
623 n
= diff
> uio
->uio_resid
? uio
->uio_resid
: diff
;
624 diff
= dep
->de_FileSize
- uio
->uio_offset
;
627 diff
= blsize
- bp
->b_resid
;
630 error
= uiomove(bp
->b_data
+ on
, (int) n
, uio
);
632 } while (error
== 0 && uio
->uio_resid
> 0 && n
!= 0);
633 if (!isadir
&& (error
== 0 || uio
->uio_resid
!= orig_resid
) &&
634 (vp
->v_mount
->mnt_flag
& MNT_NOATIME
) == 0)
635 dep
->de_flag
|= DE_ACCESS
;
640 * Write data to a file or directory.
642 * msdosfs_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
643 * struct ucred *a_cred)
646 msdosfs_write(struct vop_write_args
*ap
)
656 int ioflag
= ap
->a_ioflag
;
657 struct uio
*uio
= ap
->a_uio
;
658 struct thread
*td
= uio
->uio_td
;
659 struct vnode
*vp
= ap
->a_vp
;
660 struct vnode
*thisvp
;
661 struct denode
*dep
= VTODE(vp
);
662 struct msdosfsmount
*pmp
= dep
->de_pmp
;
663 struct proc
*p
= (td
? td
->td_proc
: NULL
);
664 struct lwp
*lp
= (td
? td
->td_lwp
: NULL
);
667 kprintf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
668 vp
, uio
, ioflag
, ap
->a_cred
);
669 kprintf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
670 dep
->de_diroffset
, dep
->de_dirclust
, dep
->de_StartCluster
);
673 switch (vp
->v_type
) {
675 if (ioflag
& IO_APPEND
)
676 uio
->uio_offset
= dep
->de_FileSize
;
682 panic("msdosfs_write(): bad file type");
685 if (uio
->uio_offset
< 0)
688 if (uio
->uio_resid
== 0)
692 * If they've exceeded their filesize limit, tell them about it.
695 ((uoff_t
)uio
->uio_offset
+ uio
->uio_resid
>
696 p
->p_rlimit
[RLIMIT_FSIZE
].rlim_cur
)) {
697 lwpsignal(p
, lp
, SIGXFSZ
);
701 if ((uoff_t
)uio
->uio_offset
+ uio
->uio_resid
> DOS_FILESIZE_MAX
)
705 * If the offset we are starting the write at is beyond the end of
706 * the file, then they've done a seek. Unix filesystems allow
707 * files with holes in them, DOS doesn't so we must fill the hole
708 * with zeroed blocks.
710 if (uio
->uio_offset
> dep
->de_FileSize
) {
711 error
= deextend(dep
, uio
->uio_offset
);
717 * Remember some values in case the write fails.
719 resid
= uio
->uio_resid
;
720 osize
= dep
->de_FileSize
;
723 * If we write beyond the end of the file, extend it to its ultimate
724 * size ahead of the time to hopefully get a contiguous area.
726 if (uio
->uio_offset
+ resid
> osize
) {
727 count
= de_clcount(pmp
, uio
->uio_offset
+ resid
) -
728 de_clcount(pmp
, osize
);
729 error
= extendfile(dep
, count
, NULL
, NULL
, 0);
730 if (error
&& (error
!= ENOSPC
|| (ioflag
& IO_UNIT
)))
732 lastcn
= dep
->de_fc
[FC_LASTFC
].fc_frcn
;
734 lastcn
= de_clcount(pmp
, osize
) - 1;
737 if (de_off2cn(pmp
, uio
->uio_offset
) > lastcn
) {
742 croffset
= uio
->uio_offset
& pmp
->pm_crbomask
;
743 n
= min(uio
->uio_resid
, pmp
->pm_bpcluster
- croffset
);
744 if (uio
->uio_offset
+ n
> dep
->de_FileSize
) {
745 dep
->de_FileSize
= uio
->uio_offset
+ n
;
746 /* The object size needs to be set before buffer is allocated */
747 vnode_pager_setsize(vp
, dep
->de_FileSize
);
751 * If either the whole cluster gets written, or we write
752 * the cluster from its start beyond EOF, then no need to
753 * read data from disk.
755 * If UIO_NOCOPY is set we have to do a read-before-write
756 * to fill in any missing pieces of the buffer since no
757 * actual overwrite will occur.
759 cn
= de_off2cn(pmp
, uio
->uio_offset
);
760 if ((uio
->uio_offset
& pmp
->pm_crbomask
) == 0
761 && uio
->uio_segflg
!= UIO_NOCOPY
762 && (de_off2cn(pmp
, uio
->uio_offset
+ uio
->uio_resid
)
763 > de_off2cn(pmp
, uio
->uio_offset
)
764 || uio
->uio_offset
+ uio
->uio_resid
>= dep
->de_FileSize
)) {
765 bp
= getblk(thisvp
, de_cn2doff(pmp
, cn
),
766 pmp
->pm_bpcluster
, 0, 0);
769 * Do the bmap now, since pcbmap needs buffers
770 * for the fat table. (see msdosfs_strategy)
772 if (bp
->b_bio2
.bio_offset
== NOOFFSET
) {
773 daddr_t lblkno
= de_off2cn(pmp
, bp
->b_loffset
);
776 error
= pcbmap(dep
, lblkno
,
777 &dblkno
, NULL
, NULL
);
778 if (error
|| dblkno
== (daddr_t
)-1) {
779 bp
->b_bio2
.bio_offset
= NOOFFSET
;
781 bp
->b_bio2
.bio_offset
= de_bntodoff(pmp
, dblkno
);
784 if (bp
->b_bio2
.bio_offset
== NOOFFSET
) {
787 error
= EIO
; /* XXX */
792 * The block we need to write into exists, so read
795 error
= bread(thisvp
, de_cn2doff(pmp
, cn
),
796 pmp
->pm_bpcluster
, &bp
);
804 * Should these vnode_pager_* functions be done on dir
809 * Copy the data from user space into the buf header.
811 error
= uiomove(bp
->b_data
+ croffset
, n
, uio
);
818 * If they want this synchronous then write it and wait for
819 * it. Otherwise, if on a cluster boundary write it
820 * asynchronously so we can move on to the next block
821 * without delay. Otherwise do a delayed write because we
822 * may want to write somemore into the block later.
824 if (ioflag
& IO_SYNC
)
826 else if (n
+ croffset
== pmp
->pm_bpcluster
)
830 dep
->de_flag
|= DE_UPDATE
;
831 } while (error
== 0 && uio
->uio_resid
> 0);
834 * If the write failed and they want us to, truncate the file back
835 * to the size it was before the write was attempted.
839 if (ioflag
& IO_UNIT
) {
840 detrunc(dep
, osize
, ioflag
& IO_SYNC
);
841 uio
->uio_offset
-= resid
- uio
->uio_resid
;
842 uio
->uio_resid
= resid
;
844 detrunc(dep
, dep
->de_FileSize
, ioflag
& IO_SYNC
);
845 if (uio
->uio_resid
!= resid
)
848 } else if (ioflag
& IO_SYNC
)
849 error
= deupdat(dep
, 1);
854 * Flush the blocks of a file to disk.
856 * This function is worthless for vnodes that represent directories. Maybe we
857 * could just do a sync if they try an fsync on a directory file.
859 * msdosfs_fsync(struct vnode *a_vp, int a_waitfor)
862 msdosfs_fsync(struct vop_fsync_args
*ap
)
864 struct vnode
*vp
= ap
->a_vp
;
867 * Flush all dirty buffers associated with a vnode.
872 vfsync(vp
, ap
->a_waitfor
, 0, NULL
, NULL
);
874 if (ap
->a_waitfor
== MNT_WAIT
&& !RB_EMPTY(&vp
->v_rbdirty_tree
)) {
875 vprint("msdosfs_fsync: dirty", vp
);
879 return (deupdat(VTODE(vp
), ap
->a_waitfor
== MNT_WAIT
));
883 * msdosfs_remove(struct vnode *a_dvp, struct vnode *a_vp,
884 * struct componentname *a_cnp)
887 msdosfs_remove(struct vop_old_remove_args
*ap
)
889 struct denode
*dep
= VTODE(ap
->a_vp
);
890 struct denode
*ddep
= VTODE(ap
->a_dvp
);
893 if (ap
->a_vp
->v_type
== VDIR
)
896 error
= removede(ddep
, dep
);
898 kprintf("msdosfs_remove(), dep %p, v_sysrefs %d\n",
899 dep
, ap
->a_vp
->v_sysref
.refcnt
);
905 * DOS filesystems don't know what links are. But since we already called
906 * msdosfs_lookup() with create and lockparent, the parent is locked so we
907 * have to free it before we return the error.
909 * msdosfs_link(struct vnode *a_tdvp, struct vnode *a_vp,
910 * struct componentname *a_cnp)
913 msdosfs_link(struct vop_old_link_args
*ap
)
919 * Renames on files require moving the denode to a new hash queue since the
920 * denode's location is used to compute which hash queue to put the file
921 * in. Unless it is a rename in place. For example "mv a b".
923 * What follows is the basic algorithm:
926 * if (dest file exists) {
929 * if (dest and src in same directory) {
930 * rewrite name in existing directory slot
932 * write new entry in dest directory
933 * update offset and dirclust in denode
934 * move denode to new hash chain
935 * clear old directory entry
939 * if (dest directory exists) {
940 * if (dest is not empty) {
943 * remove dest directory
945 * if (dest and src in same directory) {
946 * rewrite name in existing entry
948 * be sure dest is not a child of src directory
949 * write entry in dest directory
950 * update "." and ".." in moved directory
951 * clear old directory entry for moved directory
956 * source's parent directory is unlocked
957 * source file or directory is unlocked
958 * destination's parent directory is locked
959 * destination file or directory is locked if it exists
962 * all denodes should be released
965 * I'm not sure how the memory containing the pathnames pointed at by the
966 * componentname structures is freed, there may be some memory bleeding
967 * for each rename done.
969 * msdosfs_rename(struct vnode *a_fdvp, struct vnode *a_fvp,
970 * struct componentname *a_fcnp, struct vnode *a_tdvp,
971 * struct vnode *a_tvp, struct componentname *a_tcnp)
974 msdosfs_rename(struct vop_old_rename_args
*ap
)
976 struct vnode
*tdvp
= ap
->a_tdvp
;
977 struct vnode
*fvp
= ap
->a_fvp
;
978 struct vnode
*fdvp
= ap
->a_fdvp
;
979 struct vnode
*tvp
= ap
->a_tvp
;
980 struct componentname
*tcnp
= ap
->a_tcnp
;
981 struct componentname
*fcnp
= ap
->a_fcnp
;
982 struct denode
*ip
, *xp
, *dp
, *zp
;
983 u_char toname
[11], oldname
[11];
984 u_long from_diroffset
, to_diroffset
;
986 int doingdirectory
= 0, newparent
= 0;
990 struct denode
*fddep
; /* from file's parent directory */
991 struct msdosfsmount
*pmp
;
992 struct direntry
*dotdotp
;
995 fddep
= VTODE(ap
->a_fdvp
);
998 pmp
= VFSTOMSDOSFS(fdvp
->v_mount
);
1001 * Check for cross-device rename.
1003 if ((fvp
->v_mount
!= tdvp
->v_mount
) ||
1004 (tvp
&& (fvp
->v_mount
!= tvp
->v_mount
))) {
1019 * If source and dest are the same, do nothing.
1027 * fvp, fdvp are unlocked, tvp, tdvp are locked. Lock fvp and note
1028 * that we have to unlock it to use the abortit target.
1030 error
= vn_lock(fvp
, LK_EXCLUSIVE
);
1037 * Be sure we are not renaming ".", "..", or an alias of ".". This
1038 * leads to a crippled directory tree. It's pretty tough to do a
1039 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
1040 * doesn't work if the ".." entry is missing.
1042 if (ip
->de_Attributes
& ATTR_DIRECTORY
) {
1044 * Avoid ".", "..", and aliases of "." for obvious reasons.
1046 if ((fcnp
->cn_namelen
== 1 && fcnp
->cn_nameptr
[0] == '.') ||
1048 (fcnp
->cn_flags
& CNP_ISDOTDOT
) ||
1049 (tcnp
->cn_flags
& CNP_ISDOTDOT
) ||
1050 (ip
->de_flag
& DE_RENAME
)) {
1055 ip
->de_flag
|= DE_RENAME
;
1060 * fvp locked, fdvp unlocked, tvp, tdvp locked. DE_RENAME only
1061 * set if doingdirectory. We will get fvp unlocked in fairly
1062 * short order. dp and xp must be setup and fvp must be unlocked
1063 * for the out and bad targets to work properly.
1066 xp
= tvp
? VTODE(tvp
) : NULL
;
1069 * Remember direntry place to use for destination
1071 to_diroffset
= dp
->de_fndoffset
;
1072 to_count
= dp
->de_fndcnt
;
1075 * If ".." must be changed (ie the directory gets a new
1076 * parent) then the source directory must not be in the
1077 * directory heirarchy above the target, as this would
1078 * orphan everything below the source directory. Also
1079 * the user must have write permission in the source so
1080 * as to be able to change "..". We must repeat the call
1081 * to namei, as the parent directory is unlocked by the
1082 * call to doscheckpath().
1084 error
= VOP_ACCESS(fvp
, VWRITE
, tcnp
->cn_cred
);
1086 if (VTODE(fdvp
)->de_StartCluster
!= VTODE(tdvp
)->de_StartCluster
)
1090 * ok. fvp, fdvp unlocked, tvp, tdvp locked. tvp may be NULL.
1091 * DE_RENAME only set if doingdirectory.
1093 if (doingdirectory
&& newparent
) {
1094 if (error
) /* write access check above */
1101 * checkpath vput's tdvp (VTOI(dp)) on return no matter what,
1102 * get an extra ref so we wind up with just an unlocked, ref'd
1103 * tdvp. The 'out' target skips tvp and tdvp cleanups (tdvp
1104 * isn't locked so we can't use the out target).
1107 error
= doscheckpath(ip
, dp
);
1108 tcnp
->cn_flags
|= CNP_PDIRUNLOCK
;
1114 * relookup no longer messes with the ref count. tdvp must
1115 * be unlocked on entry and on success will be locked on
1118 error
= relookup(tdvp
, &tvp
, tcnp
);
1120 if (tcnp
->cn_flags
& CNP_PDIRUNLOCK
)
1128 * tvp and tdvp are now locked again.
1131 xp
= tvp
? VTODE(tvp
) : NULL
;
1135 * tvp and tdvp are now locked again, the 'bad' target can be used
1136 * to clean them up again. Delete an existant target and clean
1137 * up tvp. Set xp to NULL to indicate that tvp has been cleaned up.
1141 * Target must be empty if a directory and have no links
1142 * to it. Also, ensure source and target are compatible
1143 * (both directories, or both not directories).
1145 if (xp
->de_Attributes
& ATTR_DIRECTORY
) {
1146 if (!dosdirempty(xp
)) {
1150 if (!doingdirectory
) {
1154 } else if (doingdirectory
) {
1158 error
= removede(dp
, xp
);
1167 * Convert the filename in tcnp into a dos filename. We copy this
1168 * into the denode and directory entry for the destination
1171 error
= uniqdosname(VTODE(tdvp
), tcnp
, toname
);
1176 * Since from wasn't locked at various places above, we have to do
1177 * a relookup here. If the target and source are the same directory
1178 * we have to unlock the target directory in order to safely relookup
1179 * the source, because relookup expects its directory to be unlocked.
1181 * Note that ap->a_fvp is still valid and ref'd. Any cleanup must
1182 * now take that into account.
1184 * The tdvp locking issues make this a real mess.
1186 fcnp
->cn_flags
&= ~CNP_MODMASK
;
1187 fcnp
->cn_flags
|= CNP_LOCKPARENT
;
1190 error
= relookup(fdvp
, &fvp
, fcnp
);
1191 if (error
|| fvp
== NULL
) {
1193 * From name has disappeared. Note: fdvp might == tdvp.
1195 * DE_RENAME is only set if doingdirectory.
1198 panic("rename: lost dir entry");
1199 if (fcnp
->cn_flags
& CNP_PDIRUNLOCK
)
1212 * No error occured. tdvp, fdvp and fvp are all locked. If
1213 * newparent was 0 be aware that fdvp == tdvp. tvp has been cleaned
1214 * up. ap->a_fvp is still refd.
1218 from_diroffset
= zp
->de_fndoffset
;
1221 * Ensure that the directory entry still exists and has not
1222 * changed till now. If the source is a file the entry may
1223 * have been unlinked or renamed. In either case there is
1224 * no further work to be done. If the source is a directory
1225 * then it cannot have been rmdir'ed or renamed; this is
1226 * prohibited by the DE_RENAME flag.
1228 * DE_RENAME is only set if doingdirectory.
1232 panic("rename: lost dir entry");
1235 u_long new_dirclust
;
1236 u_long new_diroffset
;
1239 * First write a new entry in the destination
1240 * directory and mark the entry in the source directory
1241 * as deleted. Then move the denode to the correct hash
1242 * chain for its new location in the filesystem. And, if
1243 * we moved a directory, then update its .. entry to point
1244 * to the new parent directory.
1246 bcopy(ip
->de_Name
, oldname
, 11);
1247 bcopy(toname
, ip
->de_Name
, 11); /* update denode */
1248 dp
->de_fndoffset
= to_diroffset
;
1249 dp
->de_fndcnt
= to_count
;
1250 error
= createde(ip
, dp
, (struct denode
**)0, tcnp
);
1252 bcopy(oldname
, ip
->de_Name
, 11);
1256 zp
->de_fndoffset
= from_diroffset
;
1257 error
= removede(zp
, ip
);
1259 /* XXX should really panic here, fs is corrupt */
1262 if (!doingdirectory
) {
1263 error
= pcbmap(dp
, de_cluster(pmp
, to_diroffset
),
1264 NULL
, &new_dirclust
, NULL
);
1266 /* XXX should really panic here, fs is corrupt */
1269 if (new_dirclust
== MSDOSFSROOT
)
1270 new_diroffset
= to_diroffset
;
1272 new_diroffset
= to_diroffset
& pmp
->pm_crbomask
;
1273 msdosfs_reinsert(ip
, new_dirclust
, new_diroffset
);
1278 * If we moved a directory to a new parent directory, then we must
1279 * fixup the ".." entry in the moved directory.
1281 if (doingdirectory
&& newparent
) {
1282 cn
= ip
->de_StartCluster
;
1283 if (cn
== MSDOSFSROOT
) {
1284 /* this should never happen */
1285 panic("msdosfs_rename(): updating .. in root directory?");
1287 bn
= xcntobn(pmp
, cn
);
1289 error
= bread(pmp
->pm_devvp
, de_bntodoff(pmp
, bn
), pmp
->pm_bpcluster
, &bp
);
1291 /* XXX should really panic here, fs is corrupt */
1295 dotdotp
= (struct direntry
*)bp
->b_data
+ 1;
1296 putushort(dotdotp
->deStartCluster
, dp
->de_StartCluster
);
1298 putushort(dotdotp
->deHighClust
, dp
->de_StartCluster
>> 16);
1301 /* XXX should really panic here, fs is corrupt */
1307 * done case fvp, fdvp, tdvp are locked. ap->a_fvp is refd
1311 ip
->de_flag
&= ~DE_RENAME
; /* XXX fvp not locked */
1322 * 'bad' target: xp governs tvp. tvp and tdvp arel ocked, fdvp and fvp
1323 * are not locked. ip points to fvp's inode which may have DE_RENAME
1332 * 'out' target: tvp and tdvp have already been cleaned up.
1335 ip
->de_flag
&= ~DE_RENAME
;
1343 struct direntry dot
;
1344 struct direntry dotdot
;
1345 } dosdirtemplate
= {
1346 { ". ", " ", /* the . entry */
1347 ATTR_DIRECTORY
, /* file attribute */
1349 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1350 { 0, 0 }, /* access date */
1351 { 0, 0 }, /* high bits of start cluster */
1352 { 210, 4 }, { 210, 4 }, /* modify time & date */
1353 { 0, 0 }, /* startcluster */
1354 { 0, 0, 0, 0 } /* filesize */
1356 { ".. ", " ", /* the .. entry */
1357 ATTR_DIRECTORY
, /* file attribute */
1359 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1360 { 0, 0 }, /* access date */
1361 { 0, 0 }, /* high bits of start cluster */
1362 { 210, 4 }, { 210, 4 }, /* modify time & date */
1363 { 0, 0 }, /* startcluster */
1364 { 0, 0, 0, 0 } /* filesize */
1369 * msdosfs_mkdir(struct vnode *a_dvp, struct vnode **a_vpp,
1370 * struct componentname *a_cnp, struct vattr *a_vap)
1373 msdosfs_mkdir(struct vop_old_mkdir_args
*ap
)
1375 struct componentname
*cnp
= ap
->a_cnp
;
1377 struct denode
*pdep
= VTODE(ap
->a_dvp
);
1378 struct direntry
*denp
;
1379 struct msdosfsmount
*pmp
= pdep
->de_pmp
;
1381 u_long newcluster
, pcl
;
1384 struct denode ndirent
;
1388 * If this is the root directory and there is no space left we
1389 * can't do anything. This is because the root directory can not
1392 if (pdep
->de_StartCluster
== MSDOSFSROOT
1393 && pdep
->de_fndoffset
>= pdep
->de_FileSize
) {
1399 * Allocate a cluster to hold the about to be created directory.
1401 error
= clusteralloc(pmp
, 0, 1, CLUST_EOFE
, &newcluster
, NULL
);
1405 bzero(&ndirent
, sizeof(ndirent
));
1406 ndirent
.de_pmp
= pmp
;
1407 ndirent
.de_flag
= DE_ACCESS
| DE_CREATE
| DE_UPDATE
;
1409 DETIMES(&ndirent
, &ts
, &ts
, &ts
);
1412 * Now fill the cluster with the "." and ".." entries. And write
1413 * the cluster to disk. This way it is there for the parent
1414 * directory to be pointing at if there were a crash.
1416 bn
= xcntobn(pmp
, newcluster
);
1417 /* always succeeds */
1418 bp
= getblk(pmp
->pm_devvp
, de_bntodoff(pmp
, bn
),
1419 pmp
->pm_bpcluster
, 0, 0);
1420 bzero(bp
->b_data
, pmp
->pm_bpcluster
);
1421 bcopy(&dosdirtemplate
, bp
->b_data
, sizeof dosdirtemplate
);
1422 denp
= (struct direntry
*)bp
->b_data
;
1423 putushort(denp
[0].deStartCluster
, newcluster
);
1424 putushort(denp
[0].deCDate
, ndirent
.de_CDate
);
1425 putushort(denp
[0].deCTime
, ndirent
.de_CTime
);
1426 denp
[0].deCHundredth
= ndirent
.de_CHun
;
1427 putushort(denp
[0].deADate
, ndirent
.de_ADate
);
1428 putushort(denp
[0].deMDate
, ndirent
.de_MDate
);
1429 putushort(denp
[0].deMTime
, ndirent
.de_MTime
);
1430 pcl
= pdep
->de_StartCluster
;
1431 if (FAT32(pmp
) && pcl
== pmp
->pm_rootdirblk
)
1433 putushort(denp
[1].deStartCluster
, pcl
);
1434 putushort(denp
[1].deCDate
, ndirent
.de_CDate
);
1435 putushort(denp
[1].deCTime
, ndirent
.de_CTime
);
1436 denp
[1].deCHundredth
= ndirent
.de_CHun
;
1437 putushort(denp
[1].deADate
, ndirent
.de_ADate
);
1438 putushort(denp
[1].deMDate
, ndirent
.de_MDate
);
1439 putushort(denp
[1].deMTime
, ndirent
.de_MTime
);
1441 putushort(denp
[0].deHighClust
, newcluster
>> 16);
1442 putushort(denp
[1].deHighClust
, pdep
->de_StartCluster
>> 16);
1450 * Now build up a directory entry pointing to the newly allocated
1451 * cluster. This will be written to an empty slot in the parent
1454 error
= uniqdosname(pdep
, cnp
, ndirent
.de_Name
);
1458 ndirent
.de_Attributes
= ATTR_DIRECTORY
;
1459 ndirent
.de_LowerCase
= 0;
1460 ndirent
.de_StartCluster
= newcluster
;
1461 ndirent
.de_FileSize
= 0;
1462 ndirent
.de_dev
= pdep
->de_dev
;
1463 ndirent
.de_devvp
= pdep
->de_devvp
;
1464 error
= createde(&ndirent
, pdep
, &dep
, cnp
);
1467 *ap
->a_vpp
= DETOV(dep
);
1471 clusterfree(pmp
, newcluster
, NULL
);
1477 * msdosfs_rmdir(struct vnode *a_dvp, struct vnode *a_vp,
1478 * struct componentname *a_cnp)
1481 msdosfs_rmdir(struct vop_old_rmdir_args
*ap
)
1483 struct vnode
*vp
= ap
->a_vp
;
1484 struct vnode
*dvp
= ap
->a_dvp
;
1485 struct denode
*ip
, *dp
;
1492 * Verify the directory is empty (and valid).
1493 * (Rmdir ".." won't be valid since
1494 * ".." will contain a reference to
1495 * the current directory and thus be
1499 if (!dosdirempty(ip
) || ip
->de_flag
& DE_RENAME
) {
1504 * Delete the entry from the directory. For dos filesystems this
1505 * gets rid of the directory entry on disk, the in memory copy
1506 * still exists but the de_refcnt is <= 0. This prevents it from
1507 * being found by deget(). When the vput() on dep is done we give
1508 * up access and eventually msdosfs_reclaim() will be called which
1509 * will remove it from the denode cache.
1511 error
= removede(dp
, ip
);
1515 * This is where we decrement the link count in the parent
1516 * directory. Since dos filesystems don't do this we just purge
1521 * Truncate the directory that is being deleted.
1523 error
= detrunc(ip
, (u_long
)0, IO_SYNC
);
1525 vn_lock(dvp
, LK_EXCLUSIVE
| LK_RETRY
);
1531 * DOS filesystems don't know what symlinks are.
1533 * msdosfs_symlink(struct vnode *a_dvp, struct vnode **a_vpp,
1534 * struct componentname *a_cnp, struct vattr *a_vap,
1538 msdosfs_symlink(struct vop_old_symlink_args
*ap
)
1540 return (EOPNOTSUPP
);
1544 * msdosfs_readdir(struct vnode *a_vp, struct uio *a_uio,
1545 * struct ucred *a_cred, int *a_eofflag, int *a_ncookies,
1546 * off_t **a_cookies)
1549 msdosfs_readdir(struct vop_readdir_args
*ap
)
1562 struct msdosfsmount
*pmp
;
1563 struct direntry
*dentp
;
1564 struct uio
*uio
= ap
->a_uio
;
1565 off_t
*cookies
= NULL
;
1572 char *d_name_storage
= NULL
;
1575 if ((error
= vn_lock(ap
->a_vp
, LK_EXCLUSIVE
| LK_RETRY
)) != 0)
1578 dep
= VTODE(ap
->a_vp
);
1581 #ifdef MSDOSFS_DEBUG
1582 kprintf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
1583 ap
->a_vp
, uio
, ap
->a_cred
, ap
->a_eofflag
);
1587 * msdosfs_readdir() won't operate properly on regular files since
1588 * it does i/o only with the the filesystem vnode, and hence can
1589 * retrieve the wrong block from the buffer cache for a plain file.
1590 * So, fail attempts to readdir() on a plain file.
1592 if ((dep
->de_Attributes
& ATTR_DIRECTORY
) == 0) {
1598 * If the user buffer is smaller than the size of one dos directory
1599 * entry or the file offset is not a multiple of the size of a
1600 * directory entry, then we fail the read.
1602 off
= offset
= uio
->uio_offset
;
1603 if (uio
->uio_resid
< sizeof(struct direntry
) ||
1604 (offset
& (sizeof(struct direntry
) - 1))) {
1609 if (ap
->a_ncookies
) {
1610 ncookies
= uio
->uio_resid
/ 16 + 1;
1611 if (ncookies
> 1024)
1613 MALLOC(cookies
, off_t
*, ncookies
* sizeof(off_t
), M_TEMP
,
1615 *ap
->a_cookies
= cookies
;
1616 *ap
->a_ncookies
= ncookies
;
1619 dirsperblk
= pmp
->pm_BytesPerSec
/ sizeof(struct direntry
);
1622 * If they are reading from the root directory then, we simulate
1623 * the . and .. entries since these don't exist in the root
1624 * directory. We also set the offset bias to make up for having to
1625 * simulate these entries. By this I mean that at file offset 64 we
1626 * read the first entry in the root directory that lives on disk.
1628 if (dep
->de_StartCluster
== MSDOSFSROOT
1629 || (FAT32(pmp
) && dep
->de_StartCluster
== pmp
->pm_rootdirblk
)) {
1631 kprintf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n",
1634 bias
= 2 * sizeof(struct direntry
);
1635 if (offset
< bias
) {
1636 for (n
= (int)offset
/ sizeof(struct direntry
); n
< 2;
1639 d_ino
= xcntobn(pmp
, pmp
->pm_rootdirblk
)
1647 } else /* if (n == 1) */{
1651 if (vop_write_dirent(&error
, uio
, d_ino
, d_type
,
1656 offset
+= sizeof(struct direntry
);
1659 *cookies
++ = offset
;
1660 if (--ncookies
<= 0)
1667 d_name_storage
= kmalloc(WIN_MAXLEN
, M_TEMP
, M_WAITOK
);
1670 while (uio
->uio_resid
> 0) {
1671 lbn
= de_off2cn(pmp
, offset
- bias
);
1672 on
= (offset
- bias
) & pmp
->pm_crbomask
;
1673 n
= min(pmp
->pm_bpcluster
- on
, uio
->uio_resid
);
1674 diff
= dep
->de_FileSize
- (offset
- bias
);
1678 error
= pcbmap(dep
, lbn
, &bn
, &cn
, &blsize
);
1681 error
= bread(pmp
->pm_devvp
, de_bntodoff(pmp
, bn
), blsize
, &bp
);
1684 kfree(d_name_storage
, M_TEMP
);
1687 n
= min(n
, blsize
- bp
->b_resid
);
1690 * Convert from dos directory entries to fs-independent
1691 * directory entries.
1693 for (dentp
= (struct direntry
*)(bp
->b_data
+ on
);
1694 (char *)dentp
< bp
->b_data
+ on
+ n
;
1695 dentp
++, offset
+= sizeof(struct direntry
)) {
1697 kprintf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
1698 dentp
, prev
, crnt
, dentp
->deName
[0], dentp
->deAttributes
);
1700 d_name
= d_name_storage
;
1702 * If this is an unused entry, we can stop.
1704 if (dentp
->deName
[0] == SLOT_EMPTY
) {
1709 * Skip deleted entries.
1711 if (dentp
->deName
[0] == SLOT_DELETED
) {
1717 * Handle Win95 long directory entries
1719 if (dentp
->deAttributes
== ATTR_WIN95
) {
1720 if (pmp
->pm_flags
& MSDOSFSMNT_SHORTNAME
)
1722 chksum
= win2unixfn((struct winentry
*)dentp
,
1723 d_name
, &d_namlen
, chksum
,
1724 pmp
->pm_flags
& MSDOSFSMNT_U2WTABLE
,
1730 * Skip volume labels
1732 if (dentp
->deAttributes
& ATTR_VOLUME
) {
1737 * This computation of d_ino must match
1738 * the computation of va_fileid in
1741 if (dentp
->deAttributes
& ATTR_DIRECTORY
) {
1742 d_ino
= getushort(dentp
->deStartCluster
);
1744 d_ino
|= getushort(dentp
->deHighClust
) << 16;
1745 /* if this is the root directory */
1746 if (d_ino
!= MSDOSFSROOT
)
1747 d_ino
= xcntobn(pmp
, d_ino
) * dirsperblk
;
1748 else if (FAT32(pmp
))
1749 d_ino
= xcntobn(pmp
, pmp
->pm_rootdirblk
)
1755 d_ino
= offset
/ sizeof(struct direntry
);
1758 if (chksum
!= winChksum(dentp
->deName
)) {
1759 d_namlen
= dos2unixfn(dentp
->deName
,
1761 dentp
->deLowerCase
|
1762 ((pmp
->pm_flags
& MSDOSFSMNT_SHORTNAME
) ?
1763 (LCASE_BASE
| LCASE_EXT
) : 0),
1764 pmp
->pm_flags
& MSDOSFSMNT_U2WTABLE
,
1766 pmp
->pm_flags
& MSDOSFSMNT_ULTABLE
,
1770 if (vop_write_dirent(&error
, uio
, d_ino
, d_type
,
1771 d_namlen
, d_name
)) {
1781 *cookies
++ = offset
+ sizeof(struct direntry
);
1782 if (--ncookies
<= 0) {
1787 off
= offset
+ sizeof(struct direntry
);
1792 if (d_name_storage
!= NULL
)
1793 kfree(d_name_storage
, M_TEMP
);
1795 /* Subtract unused cookies */
1797 *ap
->a_ncookies
-= ncookies
;
1799 uio
->uio_offset
= off
;
1802 * Set the eofflag (NFS uses it)
1804 if (ap
->a_eofflag
) {
1805 if (dep
->de_FileSize
- (offset
- bias
) <= 0)
1811 vn_unlock(ap
->a_vp
);
1816 * vp - address of vnode file the file
1817 * bn - which cluster we are interested in mapping to a filesystem block number.
1818 * vpp - returns the vnode for the block special file holding the filesystem
1819 * containing the file of interest
1820 * bnp - address of where to return the filesystem relative block number
1822 * msdosfs_bmap(struct vnode *a_vp, off_t a_loffset,
1823 * off_t *a_doffsetp, int *a_runp, int *a_runb)
1826 msdosfs_bmap(struct vop_bmap_args
*ap
)
1828 struct denode
*dep
= VTODE(ap
->a_vp
);
1829 struct msdosfsmount
*pmp
= dep
->de_pmp
;
1834 if (ap
->a_doffsetp
== NULL
)
1838 * Sequential clusters should be counted here.
1845 KKASSERT(((int)ap
->a_loffset
& ((1 << pmp
->pm_cnshift
) - 1)) == 0);
1846 lbn
= de_off2cn(pmp
, ap
->a_loffset
);
1847 error
= pcbmap(dep
, lbn
, &dbn
, NULL
, NULL
);
1848 if (error
|| dbn
== (daddr_t
)-1) {
1849 *ap
->a_doffsetp
= NOOFFSET
;
1851 *ap
->a_doffsetp
= de_bntodoff(pmp
, dbn
);
1857 * msdosfs_strategy(struct vnode *a_vp, struct bio *a_bio)
1860 msdosfs_strategy(struct vop_strategy_args
*ap
)
1862 struct bio
*bio
= ap
->a_bio
;
1864 struct buf
*bp
= bio
->bio_buf
;
1865 struct vnode
*vp
= ap
->a_vp
;
1866 struct denode
*dep
= VTODE(vp
);
1867 struct msdosfsmount
*pmp
= dep
->de_pmp
;
1871 if (vp
->v_type
== VBLK
|| vp
->v_type
== VCHR
)
1872 panic("msdosfs_strategy: spec");
1874 * If we don't already know the filesystem relative block number
1875 * then get it using pcbmap(). If pcbmap() returns the block
1876 * number as -1 then we've got a hole in the file. DOS filesystems
1877 * don't allow files with holes, so we shouldn't ever see this.
1879 nbio
= push_bio(bio
);
1880 if (nbio
->bio_offset
== NOOFFSET
) {
1881 error
= pcbmap(dep
, de_off2cn(pmp
, bio
->bio_offset
),
1882 &dblkno
, NULL
, NULL
);
1884 bp
->b_error
= error
;
1885 bp
->b_flags
|= B_ERROR
;
1886 /* I/O was never started on nbio, must biodone(bio) */
1890 if (dblkno
== (daddr_t
)-1) {
1891 nbio
->bio_offset
= NOOFFSET
;
1894 nbio
->bio_offset
= de_bntodoff(pmp
, dblkno
);
1897 if (nbio
->bio_offset
== NOOFFSET
) {
1898 /* I/O was never started on nbio, must biodone(bio) */
1903 * Read/write the block from/to the disk that contains the desired
1906 vn_strategy(dep
->de_devvp
, nbio
);
1911 * msdosfs_print(struct vnode *vp)
1914 msdosfs_print(struct vop_print_args
*ap
)
1916 struct denode
*dep
= VTODE(ap
->a_vp
);
1919 "tag VT_MSDOSFS, startcluster %lu, dircluster %lu, diroffset %lu ",
1920 dep
->de_StartCluster
, dep
->de_dirclust
, dep
->de_diroffset
);
1921 kprintf(" dev %d, %d", major(dep
->de_dev
), minor(dep
->de_dev
));
1922 lockmgr_printinfo(&ap
->a_vp
->v_lock
);
1928 * msdosfs_pathconf(struct vnode *a_vp, int a_name, int *a_retval)
1931 msdosfs_pathconf(struct vop_pathconf_args
*ap
)
1933 struct msdosfsmount
*pmp
= VTODE(ap
->a_vp
)->de_pmp
;
1935 switch (ap
->a_name
) {
1940 *ap
->a_retval
= pmp
->pm_flags
& MSDOSFSMNT_LONGNAME
? WIN_MAXLEN
: 12;
1943 *ap
->a_retval
= PATH_MAX
;
1945 case _PC_CHOWN_RESTRICTED
:
1957 /* Global vfs data structures for msdosfs */
1958 struct vop_ops msdosfs_vnode_vops
= {
1959 .vop_default
= vop_defaultop
,
1960 .vop_access
= msdosfs_access
,
1961 .vop_bmap
= msdosfs_bmap
,
1962 .vop_old_lookup
= msdosfs_lookup
,
1963 .vop_open
= msdosfs_open
,
1964 .vop_close
= msdosfs_close
,
1965 .vop_old_create
= msdosfs_create
,
1966 .vop_fsync
= msdosfs_fsync
,
1967 .vop_getattr
= msdosfs_getattr
,
1968 .vop_inactive
= msdosfs_inactive
,
1969 .vop_old_link
= msdosfs_link
,
1970 .vop_old_mkdir
= msdosfs_mkdir
,
1971 .vop_old_mknod
= msdosfs_mknod
,
1972 .vop_pathconf
= msdosfs_pathconf
,
1973 .vop_print
= msdosfs_print
,
1974 .vop_read
= msdosfs_read
,
1975 .vop_readdir
= msdosfs_readdir
,
1976 .vop_reclaim
= msdosfs_reclaim
,
1977 .vop_old_remove
= msdosfs_remove
,
1978 .vop_old_rename
= msdosfs_rename
,
1979 .vop_old_rmdir
= msdosfs_rmdir
,
1980 .vop_setattr
= msdosfs_setattr
,
1981 .vop_strategy
= msdosfs_strategy
,
1982 .vop_old_symlink
= msdosfs_symlink
,
1983 .vop_write
= msdosfs_write
,
1984 .vop_getpages
= vop_stdgetpages
,
1985 .vop_putpages
= vop_stdputpages