1 /* $FreeBSD: /usr/local/www/cvsroot/FreeBSD/src/sys/msdosfs/Attic/msdosfs_vfsops.c,v 1.60.2.8 2004/03/02 09:43:04 tjr Exp $ */
2 /* $DragonFly: src/sys/vfs/msdosfs/msdosfs_vfsops.c,v 1.52 2008/09/17 21:44:24 dillon Exp $ */
3 /* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws 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>
56 #include <sys/nlookup.h>
57 #include <sys/kernel.h>
58 #include <sys/vnode.h>
59 #include <sys/iconv.h>
60 #include <sys/mount.h>
62 #include <sys/fcntl.h>
63 #include <sys/malloc.h>
64 #include <sys/stat.h> /* defines ALLPERMS */
65 #include <vm/vm_zone.h>
73 #include "msdosfsmount.h"
76 extern struct vop_ops msdosfs_vnode_vops;
77 struct iconv_functions *msdos_iconv;
79 #define MSDOSFS_DFLTBSIZE 4096
80 #define ENCODING_UNICODE "UTF-16BE"
83 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a
84 * garbage or a random value :-{
85 * If you want to use that broken-signatured media, define the
86 * following symbol even though PC/AT.
87 * (ex. mount PC-98 DOS formatted FD on PC/AT)
89 #define MSDOSFS_NOCHECKSIG
92 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure");
93 static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table");
95 static int update_mp (struct mount *mp, struct msdosfs_args *argp);
96 static int mountmsdosfs (struct vnode *devvp, struct mount *mp,
97 struct msdosfs_args *argp);
98 static int msdosfs_fhtovp (struct mount *, struct vnode *,
99 struct fid *, struct vnode **);
100 static int msdosfs_checkexp (struct mount *, struct sockaddr *,
101 int *, struct ucred **);
102 static int msdosfs_mount (struct mount *, char *, caddr_t,
104 static int msdosfs_root (struct mount *, struct vnode **);
105 static int msdosfs_statfs (struct mount *, struct statfs *,
107 static int msdosfs_sync (struct mount *, int);
108 static int msdosfs_unmount (struct mount *, int);
109 static int msdosfs_vptofh (struct vnode *, struct fid *);
112 update_mp(struct mount *mp, struct msdosfs_args *argp)
114 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
116 char cs_local[ICONV_CSNMAXLEN];
117 char cs_dos[ICONV_CSNMAXLEN];
119 pmp->pm_gid = argp->gid;
120 pmp->pm_uid = argp->uid;
121 pmp->pm_mask = argp->mask & ALLPERMS;
122 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT;
123 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdos_iconv) {
124 bcopy(argp->cs_local, cs_local, sizeof(cs_local));
125 bcopy(argp->cs_dos, cs_dos, sizeof(cs_dos));
126 kprintf("local: %s dos: %s\n",argp->cs_local, argp->cs_dos);
127 error = msdos_iconv->open(cs_local, ENCODING_UNICODE, &pmp->pm_w2u);
130 error = msdos_iconv->open(ENCODING_UNICODE, cs_local, &pmp->pm_u2w);
133 error = msdos_iconv->open(cs_dos, cs_local, &pmp->pm_u2d);
136 error = msdos_iconv->open(cs_local, cs_dos, &pmp->pm_d2u);
141 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
142 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
143 else if (!(pmp->pm_flags &
144 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) {
145 struct vnode *rootvp;
148 * Try to divine whether to support Win'95 long filenames
151 pmp->pm_flags |= MSDOSFSMNT_LONGNAME;
153 if ((error = msdosfs_root(mp, &rootvp)) != 0)
155 pmp->pm_flags |= findwin95(VTODE(rootvp))
156 ? MSDOSFSMNT_LONGNAME
157 : MSDOSFSMNT_SHORTNAME;
165 * mp - path - addr in user space of mount point (ie /usr or whatever)
166 * data - addr in user space of mount params including the name of the block
167 * special file to treat as a filesystem.
170 msdosfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
172 struct vnode *devvp; /* vnode for blk device to mount */
173 struct msdosfs_args args; /* will hold data from mount request */
174 /* msdosfs specific mount control block */
175 struct msdosfsmount *pmp = NULL;
179 struct nlookupdata nd;
181 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args));
184 if (args.magic != MSDOSFS_ARGSMAGIC)
187 * If updating, check whether changing from read-only to
188 * read/write; if there is no device name, that's all we do.
190 if (mp->mnt_flag & MNT_UPDATE) {
191 pmp = VFSTOMSDOSFS(mp);
193 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) {
195 if (mp->mnt_flag & MNT_FORCE)
197 error = vflush(mp, 0, flags);
199 devvp = pmp->pm_devvp;
200 VOP_OPEN(devvp, FREAD, FSCRED, NULL);
201 VOP_CLOSE(devvp, FREAD|FWRITE);
202 pmp->pm_flags |= MSDOSFSMNT_RONLY;
205 if (!error && (mp->mnt_flag & MNT_RELOAD))
206 /* not yet implemented */
210 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
212 * If upgrade to read-write by non-root, then verify
213 * that user has necessary permissions on the device.
215 devvp = pmp->pm_devvp;
216 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
217 if (cred->cr_uid != 0) {
218 error = VOP_EACCESS(devvp, VREAD | VWRITE, cred);
224 VOP_OPEN(devvp, FREAD|FWRITE, FSCRED, NULL);
225 VOP_CLOSE(devvp, FREAD);
227 pmp->pm_flags &= ~MSDOSFSMNT_RONLY;
229 if (args.fspec == 0) {
230 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */
231 if (args.flags & MSDOSFSMNT_MNTOPT) {
232 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT;
233 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT;
234 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
235 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
239 * Process export requests.
241 return (vfs_export(mp, &pmp->pm_export, &args.export));
245 * Not an update, or updating the name: look up the name
246 * and verify that it refers to a sensible block device.
249 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW);
251 error = nlookup(&nd);
253 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
258 if (!vn_isdisk(devvp, &error)) {
263 * If mount by non-root, then verify that user has necessary
264 * permissions on the device.
266 if (cred->cr_uid != 0) {
268 if ((mp->mnt_flag & MNT_RDONLY) == 0)
269 accessmode |= VWRITE;
270 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
271 error = VOP_EACCESS(devvp, accessmode, cred);
278 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
279 error = mountmsdosfs(devvp, mp, &args);
280 #ifdef MSDOSFS_DEBUG /* only needed for the kprintf below */
281 pmp = VFSTOMSDOSFS(mp);
284 if (devvp != pmp->pm_devvp)
285 error = EINVAL; /* XXX needs translation */
294 error = update_mp(mp, &args);
296 msdosfs_unmount(mp, MNT_FORCE);
300 copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
301 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
302 msdosfs_statfs(mp, &mp->mnt_stat, cred);
304 kprintf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap);
310 mountmsdosfs(struct vnode *devvp, struct mount *mp, struct msdosfs_args *argp)
312 struct msdosfsmount *pmp;
315 union bootsector *bsp;
316 struct byte_bpb33 *b33;
317 struct byte_bpb50 *b50;
318 struct byte_bpb710 *b710;
319 u_int8_t SecPerClust;
324 * Disallow multiple mounts of the same device.
325 * Disallow mounting of a device that is currently in use
326 * Flush out any old buffers remaining from a previous use.
328 error = vfs_mountedon(devvp);
331 if (vcount(devvp) > 0)
333 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
334 error = vinvalbuf(devvp, V_SAVE, 0, 0);
339 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
340 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
341 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL);
346 bp = NULL; /* both used in error_exit */
350 * Read the boot sector of the filesystem, and then check the
351 * boot signature. If not a dos boot sector then error out.
353 * NOTE: 2048 is a maximum sector size in current...
355 error = bread(devvp, 0, 2048, &bp);
358 bp->b_flags |= B_AGE;
359 bsp = (union bootsector *)bp->b_data;
360 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB;
361 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB;
362 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP;
364 #ifndef MSDOSFS_NOCHECKSIG
365 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0
366 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) {
372 pmp = kmalloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO);
376 * Compute several useful quantities from the bpb in the
377 * bootsector. Copy in the dos 5 variant of the bpb then fix up
378 * the fields that are different between dos 5 and dos 3.3.
380 SecPerClust = b50->bpbSecPerClust;
381 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec);
382 pmp->pm_ResSectors = getushort(b50->bpbResSectors);
383 pmp->pm_FATs = b50->bpbFATs;
384 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts);
385 pmp->pm_Sectors = getushort(b50->bpbSectors);
386 pmp->pm_FATsecs = getushort(b50->bpbFATsecs);
387 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack);
388 pmp->pm_Heads = getushort(b50->bpbHeads);
389 pmp->pm_Media = b50->bpbMedia;
391 /* calculate the ratio of sector size to DEV_BSIZE */
392 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE;
395 * We don't check pm_Heads nor pm_SecPerTrack, because
396 * these may not be set for EFI file systems. We don't
397 * use these anyway, so we're unaffected if they are
400 if (!pmp->pm_BytesPerSec || !SecPerClust) {
405 if (pmp->pm_Sectors == 0) {
406 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs);
407 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors);
409 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs);
410 pmp->pm_HugeSectors = pmp->pm_Sectors;
413 if (pmp->pm_RootDirEnts == 0) {
416 || getushort(b710->bpbFSVers)) {
418 kprintf("mountmsdosfs(): bad FAT32 filesystem\n");
421 pmp->pm_fatmask = FAT32_MASK;
424 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs);
425 if (getushort(b710->bpbExtFlags) & FATMIRROR)
426 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM;
428 pmp->pm_flags |= MSDOSFS_FATMIRROR;
430 pmp->pm_flags |= MSDOSFS_FATMIRROR;
433 * Check a few values (could do some more):
434 * - logical sector size: power of 2, >= block size
435 * - sectors per cluster: power of 2, >= 1
436 * - number of sectors: >= 1, <= size of partition
438 if ( (SecPerClust == 0)
439 || (SecPerClust & (SecPerClust - 1))
440 || (pmp->pm_BytesPerSec < DEV_BSIZE)
441 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1))
442 || (pmp->pm_HugeSectors == 0)
448 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec;
449 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */
450 pmp->pm_FATsecs *= pmp->pm_BlkPerSec;
451 SecPerClust *= pmp->pm_BlkPerSec;
453 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec;
456 pmp->pm_rootdirblk = getulong(b710->bpbRootClust);
457 pmp->pm_firstcluster = pmp->pm_fatblk
458 + (pmp->pm_FATs * pmp->pm_FATsecs);
459 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec;
461 pmp->pm_rootdirblk = pmp->pm_fatblk +
462 (pmp->pm_FATs * pmp->pm_FATsecs);
463 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry)
465 / DEV_BSIZE; /* in blocks */
466 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize;
469 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) /
471 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */
473 if (pmp->pm_fatmask == 0) {
474 if (pmp->pm_maxcluster
475 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) {
477 * This will usually be a floppy disk. This size makes
478 * sure that one fat entry will not be split across
481 pmp->pm_fatmask = FAT12_MASK;
485 pmp->pm_fatmask = FAT16_MASK;
491 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv;
492 if (pmp->pm_maxcluster >= clusters) {
493 kprintf("Warning: number of clusters (%ld) exceeds FAT "
494 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters);
495 pmp->pm_maxcluster = clusters - 1;
500 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec;
502 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE;
504 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE;
505 pmp->pm_bnshift = DEV_BSHIFT;
508 * Compute mask and shift value for isolating cluster relative byte
509 * offsets and cluster numbers from a file offset.
511 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE;
512 pmp->pm_crbomask = pmp->pm_bpcluster - 1;
513 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1;
516 * Check for valid cluster size
517 * must be a power of 2
519 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) {
525 * Release the bootsector buffer.
527 bp->b_flags |= B_RELBUF;
534 if (pmp->pm_fsinfo) {
537 if ((error = bread(devvp, de_bntodoff(pmp, pmp->pm_fsinfo), fsi_size(pmp), &bp)) != 0)
539 fp = (struct fsinfo *)bp->b_data;
540 if (!bcmp(fp->fsisig1, "RRaA", 4)
541 && !bcmp(fp->fsisig2, "rrAa", 4)
542 && !bcmp(fp->fsisig3, "\0\0\125\252", 4)
543 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) {
544 pmp->pm_nxtfree = getulong(fp->fsinxtfree);
545 if (pmp->pm_nxtfree == 0xffffffff)
546 pmp->pm_nxtfree = CLUST_FIRST;
549 bp->b_flags |= B_RELBUF;
555 * Check and validate (or perhaps invalidate?) the fsinfo structure?
557 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) {
559 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n",
560 pmp->pm_nxtfree, pmp->pm_maxcluster);
566 * Allocate memory for the bitmap of allocated clusters, and then
569 pmp->pm_inusemap = kmalloc(((pmp->pm_maxcluster + N_INUSEBITS - 1)
571 * sizeof(*pmp->pm_inusemap),
572 M_MSDOSFSFAT, M_WAITOK);
575 * fillinusemap() needs pm_devvp.
578 pmp->pm_devvp = devvp;
581 * Have the inuse map filled in.
583 if ((error = fillinusemap(pmp)) != 0)
587 * If they want fat updates to be synchronous then let them suffer
588 * the performance degradation in exchange for the on disk copy of
589 * the fat being correct just about all the time. I suppose this
590 * would be a good thing to turn on if the kernel is still flakey.
592 if (mp->mnt_flag & MNT_SYNCHRONOUS)
593 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT;
599 pmp->pm_flags |= MSDOSFSMNT_RONLY;
602 mp->mnt_data = (qaddr_t) pmp;
603 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
604 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
605 mp->mnt_flag |= MNT_LOCAL;
606 vfs_add_vnodeops(mp, &msdosfs_vnode_vops, &mp->mnt_vn_norm_ops);
607 dev->si_mountpoint = mp;
613 bp->b_flags |= B_RELBUF;
616 VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE);
618 if (pmp->pm_inusemap)
619 kfree(pmp->pm_inusemap, M_MSDOSFSFAT);
620 kfree(pmp, M_MSDOSFSMNT);
621 mp->mnt_data = (qaddr_t)0;
627 * Unmount the filesystem described by mp.
630 msdosfs_unmount(struct mount *mp, int mntflags)
632 struct msdosfsmount *pmp;
636 if (mntflags & MNT_FORCE)
638 error = vflush(mp, 0, flags);
641 pmp = VFSTOMSDOSFS(mp);
642 pmp->pm_devvp->v_rdev->si_mountpoint = NULL;
643 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdos_iconv) {
645 msdos_iconv->close(pmp->pm_w2u);
647 msdos_iconv->close(pmp->pm_u2w);
649 msdos_iconv->close(pmp->pm_d2u);
651 msdos_iconv->close(pmp->pm_u2d);
655 struct vnode *vp = pmp->pm_devvp;
657 kprintf("msdosfs_umount(): just before calling VOP_CLOSE()\n");
658 kprintf("flag %08x, sysrefs %d, writecount %d, auxrefs %d\n",
659 vp->v_flag, vp->v_sysref.refcnt,
660 vp->v_writecount, vp->v_auxrefs);
661 kprintf("mount %p, op %p\n", vp->v_mount, vp->v_ops);
662 kprintf("mount %p\n", vp->v_mount);
663 kprintf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n",
664 RB_ROOT(&vp->v_rbclean_tree),
665 RB_ROOT(&vp->v_rbdirty_tree),
666 bio_track_active(&vp->v_track_write),
668 kprintf("union %p, tag %d, data[0] %08x, data[1] %08x\n",
669 vp->v_socket, vp->v_tag,
670 ((u_int *)vp->v_data)[0],
671 ((u_int *)vp->v_data)[1]);
674 error = VOP_CLOSE(pmp->pm_devvp,
675 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE);
676 vrele(pmp->pm_devvp);
677 kfree(pmp->pm_inusemap, M_MSDOSFSFAT);
678 kfree(pmp, M_MSDOSFSMNT);
679 mp->mnt_data = (qaddr_t)0;
680 mp->mnt_flag &= ~MNT_LOCAL;
685 msdosfs_root(struct mount *mp, struct vnode **vpp)
687 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
692 kprintf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp);
694 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep);
702 msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
704 struct msdosfsmount *pmp;
706 pmp = VFSTOMSDOSFS(mp);
707 sbp->f_bsize = pmp->pm_bpcluster;
708 sbp->f_iosize = pmp->pm_bpcluster;
709 sbp->f_blocks = pmp->pm_maxcluster + 1;
710 sbp->f_bfree = pmp->pm_freeclustercount;
711 sbp->f_bavail = pmp->pm_freeclustercount;
712 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */
713 sbp->f_ffree = 0; /* what to put in here? */
714 if (sbp != &mp->mnt_stat) {
715 sbp->f_type = mp->mnt_vfc->vfc_typenum;
716 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
718 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN);
728 static int msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data);
731 msdosfs_sync(struct mount *mp, int waitfor)
733 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
734 struct scaninfo scaninfo;
738 * If we ever switch to not updating all of the fats all the time,
739 * this would be the place to update them from the first one.
741 if (pmp->pm_fmod != 0) {
742 if (pmp->pm_flags & MSDOSFSMNT_RONLY)
743 panic("msdosfs_sync: rofs mod");
745 /* update fats here */
749 * Write back each (modified) denode.
751 scaninfo.allerror = 0;
753 while (scaninfo.rescan) {
755 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT, NULL, msdosfs_sync_scan, &scaninfo);
759 * Flush filesystem control info.
761 if ((waitfor & MNT_LAZY) == 0) {
762 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY);
763 if ((error = VOP_FSYNC(pmp->pm_devvp, waitfor, 0)) != 0)
764 scaninfo.allerror = error;
765 vn_unlock(pmp->pm_devvp);
767 return (scaninfo.allerror);
771 msdosfs_sync_scan(struct mount *mp, struct vnode *vp, void *data)
773 struct scaninfo *info = data;
778 if (vp->v_type == VNON || vp->v_type == VBAD ||
780 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 &&
781 (RB_EMPTY(&vp->v_rbdirty_tree) || (info->waitfor & MNT_LAZY)))) {
784 if ((error = VOP_FSYNC(vp, info->waitfor, 0)) != 0)
785 info->allerror = error;
790 msdosfs_fhtovp(struct mount *mp, struct vnode *rootvp,
791 struct fid *fhp, struct vnode **vpp)
793 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
794 struct defid *defhp = (struct defid *) fhp;
798 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep);
808 msdosfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp,
809 struct ucred **credanonp)
811 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
814 np = vfs_export_lookup(mp, &pmp->pm_export, nam);
817 *exflagsp = np->netc_exflags;
818 *credanonp = &np->netc_anon;
823 msdosfs_vptofh(struct vnode *vp, struct fid *fhp)
829 defhp = (struct defid *)fhp;
830 defhp->defid_len = sizeof(struct defid);
831 defhp->defid_dirclust = dep->de_dirclust;
832 defhp->defid_dirofs = dep->de_diroffset;
833 /* defhp->defid_gen = dep->de_gen; */
837 static struct vfsops msdosfs_vfsops = {
838 .vfs_mount = msdosfs_mount,
839 .vfs_unmount = msdosfs_unmount,
840 .vfs_root = msdosfs_root,
841 .vfs_statfs = msdosfs_statfs,
842 .vfs_sync = msdosfs_sync,
843 .vfs_fhtovp = msdosfs_fhtovp,
844 .vfs_checkexp = msdosfs_checkexp,
845 .vfs_vptofh = msdosfs_vptofh,
846 .vfs_init = msdosfs_init,
847 .vfs_uninit = msdosfs_uninit
850 VFS_SET(msdosfs_vfsops, msdos, 0);
851 MODULE_VERSION(msdos, 1);