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 1.51 2007/08/21 17:26:48 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);
106 static int msdosfs_getpages (struct vop_getpages_args *);
107 static int msdosfs_putpages (struct vop_putpages_args *);
110 * Some general notes:
112 * In the ufs filesystem the inodes, superblocks, and indirect blocks are
113 * read/written using the vnode for the filesystem. Blocks that represent
114 * the contents of a file are read/written using the vnode for the file
115 * (including directories when they are read/written as files). This
116 * presents problems for the dos filesystem because data that should be in
117 * an inode (if dos had them) resides in the directory itself. Since we
118 * must update directory entries without the benefit of having the vnode
119 * for the directory we must use the vnode for the filesystem. This means
120 * that when a directory is actually read/written (via read, write, or
121 * readdir, or seek) we must use the vnode for the filesystem instead of
122 * the vnode for the directory as would happen in ufs. This is to insure we
123 * retreive the correct block from the buffer cache since the hash value is
124 * based upon the vnode address and the desired block number.
128 * Create a regular file. On entry the directory to contain the file being
129 * created is locked. We must release before we return.
131 * msdosfs_create(struct vnode *a_dvp, struct vnode **a_vpp,
132 * struct componentname *a_cnp, struct vattr *a_vap)
135 msdosfs_create(struct vop_old_create_args *ap)
137 struct componentname *cnp = ap->a_cnp;
138 struct denode ndirent;
140 struct denode *pdep = VTODE(ap->a_dvp);
145 kprintf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap);
149 * If this is the root directory and there is no space left we
150 * can't do anything. This is because the root directory can not
153 if (pdep->de_StartCluster == MSDOSFSROOT
154 && pdep->de_fndoffset >= pdep->de_FileSize) {
160 * Create a directory entry for the file, then call createde() to
161 * have it installed. NOTE: DOS files are always executable. We
162 * use the absence of the owner write bit to make the file
165 bzero(&ndirent, sizeof(ndirent));
166 error = uniqdosname(pdep, cnp, ndirent.de_Name);
170 ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ?
171 ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY;
172 ndirent.de_LowerCase = 0;
173 ndirent.de_StartCluster = 0;
174 ndirent.de_FileSize = 0;
175 ndirent.de_dev = pdep->de_dev;
176 ndirent.de_devvp = pdep->de_devvp;
177 ndirent.de_pmp = pdep->de_pmp;
178 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
180 DETIMES(&ndirent, &ts, &ts, &ts);
181 error = createde(&ndirent, pdep, &dep, cnp);
184 *ap->a_vpp = DETOV(dep);
192 * msdosfs_mknod(struct vnode *a_dvp, struct vnode **a_vpp,
193 * struct componentname *a_cnp, struct vattr *a_vap)
196 msdosfs_mknod(struct vop_old_mknod_args *ap)
198 switch (ap->a_vap->va_type) {
200 return (msdosfs_mkdir((struct vop_old_mkdir_args *)ap));
204 return (msdosfs_create((struct vop_old_create_args *)ap));
214 * msdosfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
218 msdosfs_open(struct vop_open_args *ap)
220 return(vop_stdopen(ap));
224 * msdosfs_close(struct vnode *a_vp, int a_fflag)
227 msdosfs_close(struct vop_close_args *ap)
229 struct vnode *vp = ap->a_vp;
230 struct denode *dep = VTODE(vp);
233 if (vp->v_sysref.refcnt > 1) {
235 DETIMES(dep, &ts, &ts, &ts);
237 return (vop_stdclose(ap));
241 * msdosfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred)
244 msdosfs_access(struct vop_access_args *ap)
246 struct vnode *vp = ap->a_vp;
247 struct denode *dep = VTODE(ap->a_vp);
248 struct msdosfsmount *pmp = dep->de_pmp;
249 struct ucred *cred = ap->a_cred;
250 mode_t mask, file_mode, mode = ap->a_mode;
254 file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) |
255 ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH));
256 file_mode &= pmp->pm_mask;
259 * Disallow write attempts on read-only file systems;
260 * unless the file is a socket, fifo, or a block or
261 * character device resident on the file system.
264 switch (vp->v_type) {
268 if (vp->v_mount->mnt_flag & MNT_RDONLY)
276 /* User id 0 always gets access. */
277 if (cred->cr_uid == 0)
282 /* Otherwise, check the owner. */
283 if (cred->cr_uid == pmp->pm_uid) {
290 return (file_mode & mask) == mask ? 0 : EACCES;
293 /* Otherwise, check the groups. */
294 for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
295 if (pmp->pm_gid == *gp) {
302 return (file_mode & mask) == mask ? 0 : EACCES;
305 /* Otherwise, check everyone else. */
312 return (file_mode & mask) == mask ? 0 : EACCES;
316 * msdosfs_getattr(struct vnode *a_vp, struct vattr *a_vap)
319 msdosfs_getattr(struct vop_getattr_args *ap)
321 struct denode *dep = VTODE(ap->a_vp);
322 struct msdosfsmount *pmp = dep->de_pmp;
323 struct vattr *vap = ap->a_vap;
326 u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
330 DETIMES(dep, &ts, &ts, &ts);
331 vap->va_fsid = dev2udev(dep->de_dev);
333 * The following computation of the fileid must be the same as that
334 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
337 if (dep->de_Attributes & ATTR_DIRECTORY) {
338 fileid = xcntobn(pmp, dep->de_StartCluster) * dirsperblk;
339 if (dep->de_StartCluster == MSDOSFSROOT)
342 fileid = xcntobn(pmp, dep->de_dirclust) * dirsperblk;
343 if (dep->de_dirclust == MSDOSFSROOT)
344 fileid = roottobn(pmp, 0) * dirsperblk;
345 fileid += dep->de_diroffset / sizeof(struct direntry);
347 vap->va_fileid = fileid;
348 if ((dep->de_Attributes & ATTR_READONLY) == 0)
349 mode = S_IRWXU|S_IRWXG|S_IRWXO;
351 mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
352 vap->va_mode = mode & pmp->pm_mask;
353 vap->va_uid = pmp->pm_uid;
354 vap->va_gid = pmp->pm_gid;
356 vap->va_rmajor = VNOVAL;
357 vap->va_rminor = VNOVAL;
358 vap->va_size = dep->de_FileSize;
359 dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime);
360 if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) {
361 dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime);
362 dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, &vap->va_ctime);
364 vap->va_atime = vap->va_mtime;
365 vap->va_ctime = vap->va_mtime;
368 if ((dep->de_Attributes & ATTR_ARCHIVE) == 0)
369 vap->va_flags |= SF_ARCHIVED;
371 vap->va_blocksize = pmp->pm_bpcluster;
373 (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask;
374 vap->va_type = ap->a_vp->v_type;
375 vap->va_filerev = dep->de_modrev;
380 * msdosfs_setattr(struct vnode *a_vp, struct vattr *a_vap,
381 * struct ucred *a_cred)
384 msdosfs_setattr(struct vop_setattr_args *ap)
386 struct vnode *vp = ap->a_vp;
387 struct denode *dep = VTODE(ap->a_vp);
388 struct msdosfsmount *pmp = dep->de_pmp;
389 struct vattr *vap = ap->a_vap;
390 struct ucred *cred = ap->a_cred;
394 kprintf("msdosfs_setattr(): vp %p, vap %p, cred %p\n",
395 ap->a_vp, vap, cred);
399 * Check for unsettable attributes.
401 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
402 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
403 (vap->va_blocksize != VNOVAL) || (vap->va_rmajor != VNOVAL) ||
404 (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
406 kprintf("msdosfs_setattr(): returning EINVAL\n");
407 kprintf(" va_type %d, va_nlink %x, va_fsid %x, va_fileid %lx\n",
408 vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid);
409 kprintf(" va_blocksize %lx, va_rmajor %x, va_bytes %qx, va_gen %lx\n",
410 vap->va_blocksize, vap->va_rmajor, vap->va_bytes, vap->va_gen);
411 kprintf(" va_uid %x, va_gid %x\n",
412 vap->va_uid, vap->va_gid);
416 if (vap->va_flags != VNOVAL) {
417 if (vp->v_mount->mnt_flag & MNT_RDONLY)
419 if (cred->cr_uid != pmp->pm_uid &&
420 (error = suser_cred(cred, PRISON_ROOT)))
423 * We are very inconsistent about handling unsupported
424 * attributes. We ignored the access time and the
425 * read and execute bits. We were strict for the other
428 * Here we are strict, stricter than ufs in not allowing
429 * users to attempt to set SF_SETTABLE bits or anyone to
430 * set unsupported bits. However, we ignore attempts to
431 * set ATTR_ARCHIVE for directories `cp -pr' from a more
432 * sensible file system attempts it a lot.
434 if (cred->cr_uid != 0) {
435 if (vap->va_flags & SF_SETTABLE)
438 if (vap->va_flags & ~SF_ARCHIVED)
440 if (vap->va_flags & SF_ARCHIVED)
441 dep->de_Attributes &= ~ATTR_ARCHIVE;
442 else if (!(dep->de_Attributes & ATTR_DIRECTORY))
443 dep->de_Attributes |= ATTR_ARCHIVE;
444 dep->de_flag |= DE_MODIFIED;
447 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
451 if (vp->v_mount->mnt_flag & MNT_RDONLY)
454 if (uid == (uid_t)VNOVAL)
457 if (gid == (gid_t)VNOVAL)
459 if ((cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid ||
460 (gid != pmp->pm_gid && !groupmember(gid, cred))) &&
461 (error = suser_cred(cred, PRISON_ROOT)))
463 if (uid != pmp->pm_uid || gid != pmp->pm_gid)
467 if (vap->va_size != VNOVAL) {
469 * Disallow write attempts on read-only file systems;
470 * unless the file is a socket, fifo, or a block or
471 * character device resident on the file system.
473 switch (vp->v_type) {
479 if (vp->v_mount->mnt_flag & MNT_RDONLY)
485 error = detrunc(dep, vap->va_size, 0);
489 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
490 if (vp->v_mount->mnt_flag & MNT_RDONLY)
492 if (cred->cr_uid != pmp->pm_uid &&
493 (error = suser_cred(cred, PRISON_ROOT)) &&
494 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
495 (error = VOP_ACCESS(ap->a_vp, VWRITE, cred))))
497 if (vp->v_type != VDIR) {
498 if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 &&
499 vap->va_atime.tv_sec != VNOVAL) {
500 dep->de_flag &= ~DE_ACCESS;
501 unix2dostime(&vap->va_atime, &dep->de_ADate,
504 if (vap->va_mtime.tv_sec != VNOVAL) {
505 dep->de_flag &= ~DE_UPDATE;
506 unix2dostime(&vap->va_mtime, &dep->de_MDate,
507 &dep->de_MTime, NULL);
509 dep->de_Attributes |= ATTR_ARCHIVE;
510 dep->de_flag |= DE_MODIFIED;
514 * DOS files only have the ability to have their writability
515 * attribute set, so we use the owner write bit to set the readonly
518 if (vap->va_mode != (mode_t)VNOVAL) {
519 if (vp->v_mount->mnt_flag & MNT_RDONLY)
521 if (cred->cr_uid != pmp->pm_uid &&
522 (error = suser_cred(cred, PRISON_ROOT)))
524 if (vp->v_type != VDIR) {
525 /* We ignore the read and execute bits. */
526 if (vap->va_mode & VWRITE)
527 dep->de_Attributes &= ~ATTR_READONLY;
529 dep->de_Attributes |= ATTR_READONLY;
530 dep->de_Attributes |= ATTR_ARCHIVE;
531 dep->de_flag |= DE_MODIFIED;
534 return (deupdat(dep, 1));
538 * msdosfs_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
539 * struct ucred *a_cred)
542 msdosfs_read(struct vop_read_args *ap)
558 struct vnode *vp = ap->a_vp;
559 struct denode *dep = VTODE(vp);
560 struct msdosfsmount *pmp = dep->de_pmp;
561 struct uio *uio = ap->a_uio;
563 if (uio->uio_offset < 0)
566 if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX)
569 * If they didn't ask for any data, then we are done.
571 orig_resid = uio->uio_resid;
575 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
577 isadir = dep->de_Attributes & ATTR_DIRECTORY;
579 if (uio->uio_offset >= dep->de_FileSize)
583 * note: lbn is a cluster number, not a device block number.
585 lbn = de_off2cn(pmp, uio->uio_offset);
586 loffset = de_cn2doff(pmp, lbn);
589 * If we are operating on a directory file then be sure to
590 * do i/o with the vnode for the filesystem instead of the
591 * vnode for the directory.
595 * convert cluster # to block #. lbn is a
596 * device block number after this.
598 error = pcbmap(dep, lbn, &lbn, NULL, &blsize);
599 loffset = de_bntodoff(pmp, lbn);
600 if (error == E2BIG) {
605 error = bread(pmp->pm_devvp, loffset, blsize, &bp);
607 blsize = pmp->pm_bpcluster;
609 raoffset = de_cn2doff(pmp, rablock);
611 raoffset < dep->de_FileSize) {
612 rasize = pmp->pm_bpcluster;
613 error = breadn(vp, loffset, blsize,
614 &raoffset, &rasize, 1, &bp);
616 error = bread(vp, loffset, blsize, &bp);
623 on = uio->uio_offset & pmp->pm_crbomask;
624 diff = pmp->pm_bpcluster - on;
625 n = diff > uio->uio_resid ? uio->uio_resid : diff;
626 diff = dep->de_FileSize - uio->uio_offset;
629 diff = blsize - bp->b_resid;
632 error = uiomove(bp->b_data + on, (int) n, uio);
634 } while (error == 0 && uio->uio_resid > 0 && n != 0);
635 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) &&
636 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
637 dep->de_flag |= DE_ACCESS;
642 * Write data to a file or directory.
644 * msdosfs_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
645 * struct ucred *a_cred)
648 msdosfs_write(struct vop_write_args *ap)
658 int ioflag = ap->a_ioflag;
659 struct uio *uio = ap->a_uio;
660 struct thread *td = uio->uio_td;
661 struct vnode *vp = ap->a_vp;
662 struct vnode *thisvp;
663 struct denode *dep = VTODE(vp);
664 struct msdosfsmount *pmp = dep->de_pmp;
665 struct proc *p = (td ? td->td_proc : NULL);
666 struct lwp *lp = (td ? td->td_lwp : NULL);
669 kprintf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n",
670 vp, uio, ioflag, ap->a_cred);
671 kprintf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n",
672 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
675 switch (vp->v_type) {
677 if (ioflag & IO_APPEND)
678 uio->uio_offset = dep->de_FileSize;
684 panic("msdosfs_write(): bad file type");
687 if (uio->uio_offset < 0)
690 if (uio->uio_resid == 0)
694 * If they've exceeded their filesize limit, tell them about it.
697 ((uoff_t)uio->uio_offset + uio->uio_resid >
698 p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) {
699 lwpsignal(p, lp, SIGXFSZ);
703 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX)
707 * If the offset we are starting the write at is beyond the end of
708 * the file, then they've done a seek. Unix filesystems allow
709 * files with holes in them, DOS doesn't so we must fill the hole
710 * with zeroed blocks.
712 if (uio->uio_offset > dep->de_FileSize) {
713 error = deextend(dep, uio->uio_offset);
719 * Remember some values in case the write fails.
721 resid = uio->uio_resid;
722 osize = dep->de_FileSize;
725 * If we write beyond the end of the file, extend it to its ultimate
726 * size ahead of the time to hopefully get a contiguous area.
728 if (uio->uio_offset + resid > osize) {
729 count = de_clcount(pmp, uio->uio_offset + resid) -
730 de_clcount(pmp, osize);
731 error = extendfile(dep, count, NULL, NULL, 0);
732 if (error && (error != ENOSPC || (ioflag & IO_UNIT)))
734 lastcn = dep->de_fc[FC_LASTFC].fc_frcn;
736 lastcn = de_clcount(pmp, osize) - 1;
739 if (de_off2cn(pmp, uio->uio_offset) > lastcn) {
744 croffset = uio->uio_offset & pmp->pm_crbomask;
745 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset);
746 if (uio->uio_offset + n > dep->de_FileSize) {
747 dep->de_FileSize = uio->uio_offset + n;
748 /* The object size needs to be set before buffer is allocated */
749 vnode_pager_setsize(vp, dep->de_FileSize);
753 * If either the whole cluster gets written, or we write
754 * the cluster from its start beyond EOF, then no need to
755 * read data from disk.
757 * If UIO_NOCOPY is set we have to do a read-before-write
758 * to fill in any missing pieces of the buffer since no
759 * actual overwrite will occur.
761 cn = de_off2cn(pmp, uio->uio_offset);
762 if ((uio->uio_offset & pmp->pm_crbomask) == 0
763 && uio->uio_segflg != UIO_NOCOPY
764 && (de_off2cn(pmp, uio->uio_offset + uio->uio_resid)
765 > de_off2cn(pmp, uio->uio_offset)
766 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) {
767 bp = getblk(thisvp, de_cn2doff(pmp, cn),
768 pmp->pm_bpcluster, 0, 0);
771 * Do the bmap now, since pcbmap needs buffers
772 * for the fat table. (see msdosfs_strategy)
774 if (bp->b_bio2.bio_offset == NOOFFSET) {
775 daddr_t lblkno = de_off2cn(pmp, bp->b_loffset);
778 error = pcbmap(dep, lblkno,
779 &dblkno, NULL, NULL);
780 if (error || dblkno == (daddr_t)-1) {
781 bp->b_bio2.bio_offset = NOOFFSET;
783 bp->b_bio2.bio_offset = de_bntodoff(pmp, dblkno);
786 if (bp->b_bio2.bio_offset == NOOFFSET) {
789 error = EIO; /* XXX */
794 * The block we need to write into exists, so read
797 error = bread(thisvp, de_cn2doff(pmp, cn),
798 pmp->pm_bpcluster, &bp);
806 * Should these vnode_pager_* functions be done on dir
811 * Copy the data from user space into the buf header.
813 error = uiomove(bp->b_data + croffset, n, uio);
820 * If they want this synchronous then write it and wait for
821 * it. Otherwise, if on a cluster boundary write it
822 * asynchronously so we can move on to the next block
823 * without delay. Otherwise do a delayed write because we
824 * may want to write somemore into the block later.
826 if (ioflag & IO_SYNC)
828 else if (n + croffset == pmp->pm_bpcluster)
832 dep->de_flag |= DE_UPDATE;
833 } while (error == 0 && uio->uio_resid > 0);
836 * If the write failed and they want us to, truncate the file back
837 * to the size it was before the write was attempted.
841 if (ioflag & IO_UNIT) {
842 detrunc(dep, osize, ioflag & IO_SYNC);
843 uio->uio_offset -= resid - uio->uio_resid;
844 uio->uio_resid = resid;
846 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC);
847 if (uio->uio_resid != resid)
850 } else if (ioflag & IO_SYNC)
851 error = deupdat(dep, 1);
856 * Flush the blocks of a file to disk.
858 * This function is worthless for vnodes that represent directories. Maybe we
859 * could just do a sync if they try an fsync on a directory file.
861 * msdosfs_fsync(struct vnode *a_vp, int a_waitfor)
864 msdosfs_fsync(struct vop_fsync_args *ap)
866 struct vnode *vp = ap->a_vp;
869 * Flush all dirty buffers associated with a vnode.
874 vfsync(vp, ap->a_waitfor, 0, NULL, NULL);
876 if (ap->a_waitfor == MNT_WAIT && !RB_EMPTY(&vp->v_rbdirty_tree)) {
877 vprint("msdosfs_fsync: dirty", vp);
881 return (deupdat(VTODE(vp), ap->a_waitfor == MNT_WAIT));
885 * msdosfs_remove(struct vnode *a_dvp, struct vnode *a_vp,
886 * struct componentname *a_cnp)
889 msdosfs_remove(struct vop_old_remove_args *ap)
891 struct denode *dep = VTODE(ap->a_vp);
892 struct denode *ddep = VTODE(ap->a_dvp);
895 if (ap->a_vp->v_type == VDIR)
898 error = removede(ddep, dep);
900 kprintf("msdosfs_remove(), dep %p, v_sysrefs %d\n",
901 dep, ap->a_vp->v_sysref.refcnt);
907 * DOS filesystems don't know what links are. But since we already called
908 * msdosfs_lookup() with create and lockparent, the parent is locked so we
909 * have to free it before we return the error.
911 * msdosfs_link(struct vnode *a_tdvp, struct vnode *a_vp,
912 * struct componentname *a_cnp)
915 msdosfs_link(struct vop_old_link_args *ap)
921 * Renames on files require moving the denode to a new hash queue since the
922 * denode's location is used to compute which hash queue to put the file
923 * in. Unless it is a rename in place. For example "mv a b".
925 * What follows is the basic algorithm:
928 * if (dest file exists) {
931 * if (dest and src in same directory) {
932 * rewrite name in existing directory slot
934 * write new entry in dest directory
935 * update offset and dirclust in denode
936 * move denode to new hash chain
937 * clear old directory entry
941 * if (dest directory exists) {
942 * if (dest is not empty) {
945 * remove dest directory
947 * if (dest and src in same directory) {
948 * rewrite name in existing entry
950 * be sure dest is not a child of src directory
951 * write entry in dest directory
952 * update "." and ".." in moved directory
953 * clear old directory entry for moved directory
958 * source's parent directory is unlocked
959 * source file or directory is unlocked
960 * destination's parent directory is locked
961 * destination file or directory is locked if it exists
964 * all denodes should be released
967 * I'm not sure how the memory containing the pathnames pointed at by the
968 * componentname structures is freed, there may be some memory bleeding
969 * for each rename done.
971 * msdosfs_rename(struct vnode *a_fdvp, struct vnode *a_fvp,
972 * struct componentname *a_fcnp, struct vnode *a_tdvp,
973 * struct vnode *a_tvp, struct componentname *a_tcnp)
976 msdosfs_rename(struct vop_old_rename_args *ap)
978 struct vnode *tdvp = ap->a_tdvp;
979 struct vnode *fvp = ap->a_fvp;
980 struct vnode *fdvp = ap->a_fdvp;
981 struct vnode *tvp = ap->a_tvp;
982 struct componentname *tcnp = ap->a_tcnp;
983 struct componentname *fcnp = ap->a_fcnp;
984 struct denode *ip, *xp, *dp, *zp;
985 u_char toname[11], oldname[11];
986 u_long from_diroffset, to_diroffset;
988 int doingdirectory = 0, newparent = 0;
992 struct denode *fddep; /* from file's parent directory */
993 struct msdosfsmount *pmp;
994 struct direntry *dotdotp;
997 fddep = VTODE(ap->a_fdvp);
1000 pmp = VFSTOMSDOSFS(fdvp->v_mount);
1003 * Check for cross-device rename.
1005 if ((fvp->v_mount != tdvp->v_mount) ||
1006 (tvp && (fvp->v_mount != tvp->v_mount))) {
1021 * If source and dest are the same, do nothing.
1029 * fvp, fdvp are unlocked, tvp, tdvp are locked. Lock fvp and note
1030 * that we have to unlock it to use the abortit target.
1032 error = vn_lock(fvp, LK_EXCLUSIVE);
1039 * Be sure we are not renaming ".", "..", or an alias of ".". This
1040 * leads to a crippled directory tree. It's pretty tough to do a
1041 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
1042 * doesn't work if the ".." entry is missing.
1044 if (ip->de_Attributes & ATTR_DIRECTORY) {
1046 * Avoid ".", "..", and aliases of "." for obvious reasons.
1048 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
1050 (fcnp->cn_flags & CNP_ISDOTDOT) ||
1051 (tcnp->cn_flags & CNP_ISDOTDOT) ||
1052 (ip->de_flag & DE_RENAME)) {
1057 ip->de_flag |= DE_RENAME;
1062 * fvp locked, fdvp unlocked, tvp, tdvp locked. DE_RENAME only
1063 * set if doingdirectory. We will get fvp unlocked in fairly
1064 * short order. dp and xp must be setup and fvp must be unlocked
1065 * for the out and bad targets to work properly.
1068 xp = tvp ? VTODE(tvp) : NULL;
1071 * Remember direntry place to use for destination
1073 to_diroffset = dp->de_fndoffset;
1074 to_count = dp->de_fndcnt;
1077 * If ".." must be changed (ie the directory gets a new
1078 * parent) then the source directory must not be in the
1079 * directory heirarchy above the target, as this would
1080 * orphan everything below the source directory. Also
1081 * the user must have write permission in the source so
1082 * as to be able to change "..". We must repeat the call
1083 * to namei, as the parent directory is unlocked by the
1084 * call to doscheckpath().
1086 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred);
1088 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
1092 * ok. fvp, fdvp unlocked, tvp, tdvp locked. tvp may be NULL.
1093 * DE_RENAME only set if doingdirectory.
1095 if (doingdirectory && newparent) {
1096 if (error) /* write access check above */
1103 * checkpath vput's tdvp (VTOI(dp)) on return no matter what,
1104 * get an extra ref so we wind up with just an unlocked, ref'd
1105 * tdvp. The 'out' target skips tvp and tdvp cleanups (tdvp
1106 * isn't locked so we can't use the out target).
1109 error = doscheckpath(ip, dp);
1110 tcnp->cn_flags |= CNP_PDIRUNLOCK;
1116 * relookup no longer messes with the ref count. tdvp must
1117 * be unlocked on entry and on success will be locked on
1120 error = relookup(tdvp, &tvp, tcnp);
1122 if (tcnp->cn_flags & CNP_PDIRUNLOCK)
1130 * tvp and tdvp are now locked again.
1133 xp = tvp ? VTODE(tvp) : NULL;
1137 * tvp and tdvp are now locked again, the 'bad' target can be used
1138 * to clean them up again. Delete an existant target and clean
1139 * up tvp. Set xp to NULL to indicate that tvp has been cleaned up.
1143 * Target must be empty if a directory and have no links
1144 * to it. Also, ensure source and target are compatible
1145 * (both directories, or both not directories).
1147 if (xp->de_Attributes & ATTR_DIRECTORY) {
1148 if (!dosdirempty(xp)) {
1152 if (!doingdirectory) {
1156 } else if (doingdirectory) {
1160 error = removede(dp, xp);
1169 * Convert the filename in tcnp into a dos filename. We copy this
1170 * into the denode and directory entry for the destination
1173 error = uniqdosname(VTODE(tdvp), tcnp, toname);
1178 * Since from wasn't locked at various places above, we have to do
1179 * a relookup here. If the target and source are the same directory
1180 * we have to unlock the target directory in order to safely relookup
1181 * the source, because relookup expects its directory to be unlocked.
1183 * Note that ap->a_fvp is still valid and ref'd. Any cleanup must
1184 * now take that into account.
1186 * The tdvp locking issues make this a real mess.
1188 fcnp->cn_flags &= ~CNP_MODMASK;
1189 fcnp->cn_flags |= CNP_LOCKPARENT;
1192 error = relookup(fdvp, &fvp, fcnp);
1193 if (error || fvp == NULL) {
1195 * From name has disappeared. Note: fdvp might == tdvp.
1197 * DE_RENAME is only set if doingdirectory.
1200 panic("rename: lost dir entry");
1201 if (fcnp->cn_flags & CNP_PDIRUNLOCK)
1214 * No error occured. tdvp, fdvp and fvp are all locked. If
1215 * newparent was 0 be aware that fdvp == tdvp. tvp has been cleaned
1216 * up. ap->a_fvp is still refd.
1220 from_diroffset = zp->de_fndoffset;
1223 * Ensure that the directory entry still exists and has not
1224 * changed till now. If the source is a file the entry may
1225 * have been unlinked or renamed. In either case there is
1226 * no further work to be done. If the source is a directory
1227 * then it cannot have been rmdir'ed or renamed; this is
1228 * prohibited by the DE_RENAME flag.
1230 * DE_RENAME is only set if doingdirectory.
1234 panic("rename: lost dir entry");
1237 u_long new_dirclust;
1238 u_long new_diroffset;
1241 * First write a new entry in the destination
1242 * directory and mark the entry in the source directory
1243 * as deleted. Then move the denode to the correct hash
1244 * chain for its new location in the filesystem. And, if
1245 * we moved a directory, then update its .. entry to point
1246 * to the new parent directory.
1248 bcopy(ip->de_Name, oldname, 11);
1249 bcopy(toname, ip->de_Name, 11); /* update denode */
1250 dp->de_fndoffset = to_diroffset;
1251 dp->de_fndcnt = to_count;
1252 error = createde(ip, dp, (struct denode **)0, tcnp);
1254 bcopy(oldname, ip->de_Name, 11);
1258 zp->de_fndoffset = from_diroffset;
1259 error = removede(zp, ip);
1261 /* XXX should really panic here, fs is corrupt */
1264 if (!doingdirectory) {
1265 error = pcbmap(dp, de_cluster(pmp, to_diroffset),
1266 NULL, &new_dirclust, NULL);
1268 /* XXX should really panic here, fs is corrupt */
1271 if (new_dirclust == MSDOSFSROOT)
1272 new_diroffset = to_diroffset;
1274 new_diroffset = to_diroffset & pmp->pm_crbomask;
1275 msdosfs_reinsert(ip, new_dirclust, new_diroffset);
1280 * If we moved a directory to a new parent directory, then we must
1281 * fixup the ".." entry in the moved directory.
1283 if (doingdirectory && newparent) {
1284 cn = ip->de_StartCluster;
1285 if (cn == MSDOSFSROOT) {
1286 /* this should never happen */
1287 panic("msdosfs_rename(): updating .. in root directory?");
1289 bn = xcntobn(pmp, cn);
1291 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), pmp->pm_bpcluster, &bp);
1293 /* XXX should really panic here, fs is corrupt */
1297 dotdotp = (struct direntry *)bp->b_data + 1;
1298 putushort(dotdotp->deStartCluster, dp->de_StartCluster);
1300 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16);
1303 /* XXX should really panic here, fs is corrupt */
1309 * done case fvp, fdvp, tdvp are locked. ap->a_fvp is refd
1313 ip->de_flag &= ~DE_RENAME; /* XXX fvp not locked */
1324 * 'bad' target: xp governs tvp. tvp and tdvp arel ocked, fdvp and fvp
1325 * are not locked. ip points to fvp's inode which may have DE_RENAME
1334 * 'out' target: tvp and tdvp have already been cleaned up.
1337 ip->de_flag &= ~DE_RENAME;
1345 struct direntry dot;
1346 struct direntry dotdot;
1347 } dosdirtemplate = {
1348 { ". ", " ", /* the . entry */
1349 ATTR_DIRECTORY, /* file attribute */
1351 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1352 { 0, 0 }, /* access date */
1353 { 0, 0 }, /* high bits of start cluster */
1354 { 210, 4 }, { 210, 4 }, /* modify time & date */
1355 { 0, 0 }, /* startcluster */
1356 { 0, 0, 0, 0 } /* filesize */
1358 { ".. ", " ", /* the .. entry */
1359 ATTR_DIRECTORY, /* file attribute */
1361 0, { 0, 0 }, { 0, 0 }, /* create time & date */
1362 { 0, 0 }, /* access date */
1363 { 0, 0 }, /* high bits of start cluster */
1364 { 210, 4 }, { 210, 4 }, /* modify time & date */
1365 { 0, 0 }, /* startcluster */
1366 { 0, 0, 0, 0 } /* filesize */
1371 * msdosfs_mkdir(struct vnode *a_dvp, struct vnode **a_vpp,
1372 * struct componentname *a_cnp, struct vattr *a_vap)
1375 msdosfs_mkdir(struct vop_old_mkdir_args *ap)
1377 struct componentname *cnp = ap->a_cnp;
1379 struct denode *pdep = VTODE(ap->a_dvp);
1380 struct direntry *denp;
1381 struct msdosfsmount *pmp = pdep->de_pmp;
1383 u_long newcluster, pcl;
1386 struct denode ndirent;
1390 * If this is the root directory and there is no space left we
1391 * can't do anything. This is because the root directory can not
1394 if (pdep->de_StartCluster == MSDOSFSROOT
1395 && pdep->de_fndoffset >= pdep->de_FileSize) {
1401 * Allocate a cluster to hold the about to be created directory.
1403 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL);
1407 bzero(&ndirent, sizeof(ndirent));
1408 ndirent.de_pmp = pmp;
1409 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE;
1411 DETIMES(&ndirent, &ts, &ts, &ts);
1414 * Now fill the cluster with the "." and ".." entries. And write
1415 * the cluster to disk. This way it is there for the parent
1416 * directory to be pointing at if there were a crash.
1418 bn = xcntobn(pmp, newcluster);
1419 /* always succeeds */
1420 bp = getblk(pmp->pm_devvp, de_bntodoff(pmp, bn),
1421 pmp->pm_bpcluster, 0, 0);
1422 bzero(bp->b_data, pmp->pm_bpcluster);
1423 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate);
1424 denp = (struct direntry *)bp->b_data;
1425 putushort(denp[0].deStartCluster, newcluster);
1426 putushort(denp[0].deCDate, ndirent.de_CDate);
1427 putushort(denp[0].deCTime, ndirent.de_CTime);
1428 denp[0].deCHundredth = ndirent.de_CHun;
1429 putushort(denp[0].deADate, ndirent.de_ADate);
1430 putushort(denp[0].deMDate, ndirent.de_MDate);
1431 putushort(denp[0].deMTime, ndirent.de_MTime);
1432 pcl = pdep->de_StartCluster;
1433 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
1435 putushort(denp[1].deStartCluster, pcl);
1436 putushort(denp[1].deCDate, ndirent.de_CDate);
1437 putushort(denp[1].deCTime, ndirent.de_CTime);
1438 denp[1].deCHundredth = ndirent.de_CHun;
1439 putushort(denp[1].deADate, ndirent.de_ADate);
1440 putushort(denp[1].deMDate, ndirent.de_MDate);
1441 putushort(denp[1].deMTime, ndirent.de_MTime);
1443 putushort(denp[0].deHighClust, newcluster >> 16);
1444 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16);
1452 * Now build up a directory entry pointing to the newly allocated
1453 * cluster. This will be written to an empty slot in the parent
1456 error = uniqdosname(pdep, cnp, ndirent.de_Name);
1460 ndirent.de_Attributes = ATTR_DIRECTORY;
1461 ndirent.de_LowerCase = 0;
1462 ndirent.de_StartCluster = newcluster;
1463 ndirent.de_FileSize = 0;
1464 ndirent.de_dev = pdep->de_dev;
1465 ndirent.de_devvp = pdep->de_devvp;
1466 error = createde(&ndirent, pdep, &dep, cnp);
1469 *ap->a_vpp = DETOV(dep);
1473 clusterfree(pmp, newcluster, NULL);
1479 * msdosfs_rmdir(struct vnode *a_dvp, struct vnode *a_vp,
1480 * struct componentname *a_cnp)
1483 msdosfs_rmdir(struct vop_old_rmdir_args *ap)
1485 struct vnode *vp = ap->a_vp;
1486 struct vnode *dvp = ap->a_dvp;
1487 struct denode *ip, *dp;
1494 * Verify the directory is empty (and valid).
1495 * (Rmdir ".." won't be valid since
1496 * ".." will contain a reference to
1497 * the current directory and thus be
1501 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) {
1506 * Delete the entry from the directory. For dos filesystems this
1507 * gets rid of the directory entry on disk, the in memory copy
1508 * still exists but the de_refcnt is <= 0. This prevents it from
1509 * being found by deget(). When the vput() on dep is done we give
1510 * up access and eventually msdosfs_reclaim() will be called which
1511 * will remove it from the denode cache.
1513 error = removede(dp, ip);
1517 * This is where we decrement the link count in the parent
1518 * directory. Since dos filesystems don't do this we just purge
1523 * Truncate the directory that is being deleted.
1525 error = detrunc(ip, (u_long)0, IO_SYNC);
1527 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1533 * DOS filesystems don't know what symlinks are.
1535 * msdosfs_symlink(struct vnode *a_dvp, struct vnode **a_vpp,
1536 * struct componentname *a_cnp, struct vattr *a_vap,
1540 msdosfs_symlink(struct vop_old_symlink_args *ap)
1542 return (EOPNOTSUPP);
1546 * msdosfs_readdir(struct vnode *a_vp, struct uio *a_uio,
1547 * struct ucred *a_cred, int *a_eofflag, int *a_ncookies,
1548 * u_long **a_cookies)
1551 msdosfs_readdir(struct vop_readdir_args *ap)
1564 struct msdosfsmount *pmp;
1565 struct direntry *dentp;
1566 struct uio *uio = ap->a_uio;
1567 u_long *cookies = NULL;
1574 char *d_name_storage = NULL;
1577 if ((error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY)) != 0)
1580 dep = VTODE(ap->a_vp);
1583 #ifdef MSDOSFS_DEBUG
1584 kprintf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n",
1585 ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
1589 * msdosfs_readdir() won't operate properly on regular files since
1590 * it does i/o only with the the filesystem vnode, and hence can
1591 * retrieve the wrong block from the buffer cache for a plain file.
1592 * So, fail attempts to readdir() on a plain file.
1594 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) {
1600 * If the user buffer is smaller than the size of one dos directory
1601 * entry or the file offset is not a multiple of the size of a
1602 * directory entry, then we fail the read.
1604 off = offset = uio->uio_offset;
1605 if (uio->uio_resid < sizeof(struct direntry) ||
1606 (offset & (sizeof(struct direntry) - 1))) {
1611 if (ap->a_ncookies) {
1612 ncookies = uio->uio_resid / 16 + 1;
1613 if (ncookies > 1024)
1615 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP,
1617 *ap->a_cookies = cookies;
1618 *ap->a_ncookies = ncookies;
1621 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
1624 * If they are reading from the root directory then, we simulate
1625 * the . and .. entries since these don't exist in the root
1626 * directory. We also set the offset bias to make up for having to
1627 * simulate these entries. By this I mean that at file offset 64 we
1628 * read the first entry in the root directory that lives on disk.
1630 if (dep->de_StartCluster == MSDOSFSROOT
1631 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) {
1633 kprintf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n",
1636 bias = 2 * sizeof(struct direntry);
1637 if (offset < bias) {
1638 for (n = (int)offset / sizeof(struct direntry); n < 2;
1641 d_ino = xcntobn(pmp, pmp->pm_rootdirblk)
1649 } else /* if (n == 1) */{
1653 if (vop_write_dirent(&error, uio, d_ino, d_type,
1658 offset += sizeof(struct direntry);
1661 *cookies++ = offset;
1662 if (--ncookies <= 0)
1669 d_name_storage = kmalloc(WIN_MAXLEN, M_TEMP, M_WAITOK);
1672 while (uio->uio_resid > 0) {
1673 lbn = de_off2cn(pmp, offset - bias);
1674 on = (offset - bias) & pmp->pm_crbomask;
1675 n = min(pmp->pm_bpcluster - on, uio->uio_resid);
1676 diff = dep->de_FileSize - (offset - bias);
1680 error = pcbmap(dep, lbn, &bn, &cn, &blsize);
1683 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, &bp);
1686 kfree(d_name_storage, M_TEMP);
1689 n = min(n, blsize - bp->b_resid);
1692 * Convert from dos directory entries to fs-independent
1693 * directory entries.
1695 for (dentp = (struct direntry *)(bp->b_data + on);
1696 (char *)dentp < bp->b_data + on + n;
1697 dentp++, offset += sizeof(struct direntry)) {
1699 kprintf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
1700 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
1702 d_name = d_name_storage;
1704 * If this is an unused entry, we can stop.
1706 if (dentp->deName[0] == SLOT_EMPTY) {
1711 * Skip deleted entries.
1713 if (dentp->deName[0] == SLOT_DELETED) {
1719 * Handle Win95 long directory entries
1721 if (dentp->deAttributes == ATTR_WIN95) {
1722 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME)
1724 chksum = win2unixfn((struct winentry *)dentp,
1725 d_name, &d_namlen, chksum,
1726 pmp->pm_flags & MSDOSFSMNT_U2WTABLE,
1732 * Skip volume labels
1734 if (dentp->deAttributes & ATTR_VOLUME) {
1739 * This computation of d_ino must match
1740 * the computation of va_fileid in
1743 if (dentp->deAttributes & ATTR_DIRECTORY) {
1744 d_ino = getushort(dentp->deStartCluster);
1746 d_ino |= getushort(dentp->deHighClust) << 16;
1747 /* if this is the root directory */
1748 if (d_ino != MSDOSFSROOT)
1749 d_ino = xcntobn(pmp, d_ino) * dirsperblk;
1750 else if (FAT32(pmp))
1751 d_ino = xcntobn(pmp, pmp->pm_rootdirblk)
1757 d_ino = offset / sizeof(struct direntry);
1760 if (chksum != winChksum(dentp->deName)) {
1761 d_namlen = dos2unixfn(dentp->deName,
1763 dentp->deLowerCase |
1764 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ?
1765 (LCASE_BASE | LCASE_EXT) : 0),
1766 pmp->pm_flags & MSDOSFSMNT_U2WTABLE,
1768 pmp->pm_flags & MSDOSFSMNT_ULTABLE,
1772 if (vop_write_dirent(&error, uio, d_ino, d_type,
1773 d_namlen, d_name)) {
1783 *cookies++ = offset + sizeof(struct direntry);
1784 if (--ncookies <= 0) {
1789 off = offset + sizeof(struct direntry);
1794 if (d_name_storage != NULL)
1795 kfree(d_name_storage, M_TEMP);
1797 /* Subtract unused cookies */
1799 *ap->a_ncookies -= ncookies;
1801 uio->uio_offset = off;
1804 * Set the eofflag (NFS uses it)
1806 if (ap->a_eofflag) {
1807 if (dep->de_FileSize - (offset - bias) <= 0)
1813 vn_unlock(ap->a_vp);
1818 * vp - address of vnode file the file
1819 * bn - which cluster we are interested in mapping to a filesystem block number.
1820 * vpp - returns the vnode for the block special file holding the filesystem
1821 * containing the file of interest
1822 * bnp - address of where to return the filesystem relative block number
1824 * msdosfs_bmap(struct vnode *a_vp, off_t a_loffset,
1825 * off_t *a_doffsetp, int *a_runp, int *a_runb)
1828 msdosfs_bmap(struct vop_bmap_args *ap)
1830 struct denode *dep = VTODE(ap->a_vp);
1831 struct msdosfsmount *pmp = dep->de_pmp;
1836 if (ap->a_doffsetp == NULL)
1840 * Sequential clusters should be counted here.
1847 KKASSERT(((int)ap->a_loffset & ((1 << pmp->pm_cnshift) - 1)) == 0);
1848 lbn = de_off2cn(pmp, ap->a_loffset);
1849 error = pcbmap(dep, lbn, &dbn, NULL, NULL);
1850 if (error || dbn == (daddr_t)-1) {
1851 *ap->a_doffsetp = NOOFFSET;
1853 *ap->a_doffsetp = de_bntodoff(pmp, dbn);
1859 * msdosfs_strategy(struct vnode *a_vp, struct bio *a_bio)
1862 msdosfs_strategy(struct vop_strategy_args *ap)
1864 struct bio *bio = ap->a_bio;
1866 struct buf *bp = bio->bio_buf;
1867 struct vnode *vp = ap->a_vp;
1868 struct denode *dep = VTODE(vp);
1869 struct msdosfsmount *pmp = dep->de_pmp;
1873 if (vp->v_type == VBLK || vp->v_type == VCHR)
1874 panic("msdosfs_strategy: spec");
1876 * If we don't already know the filesystem relative block number
1877 * then get it using pcbmap(). If pcbmap() returns the block
1878 * number as -1 then we've got a hole in the file. DOS filesystems
1879 * don't allow files with holes, so we shouldn't ever see this.
1881 nbio = push_bio(bio);
1882 if (nbio->bio_offset == NOOFFSET) {
1883 error = pcbmap(dep, de_off2cn(pmp, bio->bio_offset),
1884 &dblkno, NULL, NULL);
1886 bp->b_error = error;
1887 bp->b_flags |= B_ERROR;
1888 /* I/O was never started on nbio, must biodone(bio) */
1892 if (dblkno == (daddr_t)-1) {
1893 nbio->bio_offset = NOOFFSET;
1896 nbio->bio_offset = de_bntodoff(pmp, dblkno);
1899 if (nbio->bio_offset == NOOFFSET) {
1900 /* I/O was never started on nbio, must biodone(bio) */
1905 * Read/write the block from/to the disk that contains the desired
1908 vn_strategy(dep->de_devvp, nbio);
1913 * msdosfs_print(struct vnode *vp)
1916 msdosfs_print(struct vop_print_args *ap)
1918 struct denode *dep = VTODE(ap->a_vp);
1921 "tag VT_MSDOSFS, startcluster %lu, dircluster %lu, diroffset %lu ",
1922 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
1923 kprintf(" dev %d, %d", major(dep->de_dev), minor(dep->de_dev));
1924 lockmgr_printinfo(&ap->a_vp->v_lock);
1930 * msdosfs_pathconf(struct vnode *a_vp, int a_name, int *a_retval)
1933 msdosfs_pathconf(struct vop_pathconf_args *ap)
1935 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp;
1937 switch (ap->a_name) {
1942 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12;
1945 *ap->a_retval = PATH_MAX;
1947 case _PC_CHOWN_RESTRICTED:
1962 * XXX By default, wimp out... note that a_offset is ignored (and always
1966 msdosfs_getpages(struct vop_getpages_args *ap)
1968 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count,
1975 * XXX By default, wimp out... note that a_offset is ignored (and always
1979 msdosfs_putpages(struct vop_putpages_args *ap)
1981 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
1982 ap->a_sync, ap->a_rtvals);
1985 /* Global vfs data structures for msdosfs */
1986 struct vop_ops msdosfs_vnode_vops = {
1987 .vop_default = vop_defaultop,
1988 .vop_access = msdosfs_access,
1989 .vop_bmap = msdosfs_bmap,
1990 .vop_old_lookup = msdosfs_lookup,
1991 .vop_open = msdosfs_open,
1992 .vop_close = msdosfs_close,
1993 .vop_old_create = msdosfs_create,
1994 .vop_fsync = msdosfs_fsync,
1995 .vop_getattr = msdosfs_getattr,
1996 .vop_inactive = msdosfs_inactive,
1997 .vop_old_link = msdosfs_link,
1998 .vop_old_mkdir = msdosfs_mkdir,
1999 .vop_old_mknod = msdosfs_mknod,
2000 .vop_pathconf = msdosfs_pathconf,
2001 .vop_print = msdosfs_print,
2002 .vop_read = msdosfs_read,
2003 .vop_readdir = msdosfs_readdir,
2004 .vop_reclaim = msdosfs_reclaim,
2005 .vop_old_remove = msdosfs_remove,
2006 .vop_old_rename = msdosfs_rename,
2007 .vop_old_rmdir = msdosfs_rmdir,
2008 .vop_setattr = msdosfs_setattr,
2009 .vop_strategy = msdosfs_strategy,
2010 .vop_old_symlink = msdosfs_symlink,
2011 .vop_write = msdosfs_write,
2012 .vop_getpages = msdosfs_getpages,
2013 .vop_putpages = msdosfs_putpages