Annotation of sys/msdosfs/msdosfs_vfsops.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: msdosfs_vfsops.c,v 1.47 2007/03/21 17:29:32 thib Exp $ */
2: /* $NetBSD: msdosfs_vfsops.c,v 1.48 1997/10/18 02:54:57 briggs Exp $ */
3:
4: /*-
5: * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
6: * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
7: * All rights reserved.
8: * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by TooLs GmbH.
21: * 4. The name of TooLs GmbH may not be used to endorse or promote products
22: * derived from this software without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
25: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27: * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
30: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
32: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
33: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34: */
35: /*
36: * Written by Paul Popelka (paulp@uts.amdahl.com)
37: *
38: * You can do anything you want with this software, just don't say you wrote
39: * it, and don't remove this notice.
40: *
41: * This software is provided "as is".
42: *
43: * The author supplies this software to be publicly redistributed on the
44: * understanding that the author is not responsible for the correct
45: * functioning of this software in any circumstances and is not liable for
46: * any damages caused by this software.
47: *
48: * October 1992
49: */
50:
51: #include <sys/param.h>
52: #include <sys/systm.h>
53: #include <sys/namei.h>
54: #include <sys/proc.h>
55: #include <sys/kernel.h>
56: #include <sys/vnode.h>
57: #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */
58: #include <sys/mount.h>
59: #include <sys/buf.h>
60: #include <sys/file.h>
61: #include <sys/disklabel.h>
62: #include <sys/ioctl.h>
63: #include <sys/malloc.h>
64: #include <sys/dirent.h>
65:
66: #include <msdosfs/bpb.h>
67: #include <msdosfs/bootsect.h>
68: #include <msdosfs/direntry.h>
69: #include <msdosfs/denode.h>
70: #include <msdosfs/msdosfsmount.h>
71: #include <msdosfs/fat.h>
72:
73: int msdosfs_mount(struct mount *, const char *, void *, struct nameidata *,
74: struct proc *);
75: int msdosfs_start(struct mount *, int, struct proc *);
76: int msdosfs_unmount(struct mount *, int, struct proc *);
77: int msdosfs_root(struct mount *, struct vnode **);
78: int msdosfs_statfs(struct mount *, struct statfs *, struct proc *);
79: int msdosfs_sync(struct mount *, int, struct ucred *, struct proc *);
80: int msdosfs_fhtovp(struct mount *, struct fid *, struct vnode **);
81: int msdosfs_vptofh(struct vnode *, struct fid *);
82: int msdosfs_check_export(struct mount *mp, struct mbuf *nam,
83: int *extflagsp, struct ucred **credanonp);
84:
85: int msdosfs_mountfs(struct vnode *, struct mount *, struct proc *,
86: struct msdosfs_args *);
87:
88: int msdosfs_sync_vnode(struct vnode *, void *);
89:
90: /*
91: * mp - path - addr in user space of mount point (ie /usr or whatever)
92: * data - addr in user space of mount params including the name of the block
93: * special file to treat as a filesystem.
94: */
95: int
96: msdosfs_mount(mp, path, data, ndp, p)
97: struct mount *mp;
98: const char *path;
99: void *data;
100: struct nameidata *ndp;
101: struct proc *p;
102: {
103: struct vnode *devvp; /* vnode for blk device to mount */
104: struct msdosfs_args args; /* will hold data from mount request */
105: /* msdosfs specific mount control block */
106: struct msdosfsmount *pmp = NULL;
107: size_t size;
108: int error, flags;
109: mode_t accessmode;
110:
111: error = copyin(data, &args, sizeof(struct msdosfs_args));
112: if (error)
113: return (error);
114: /*
115: * If updating, check whether changing from read-only to
116: * read/write; if there is no device name, that's all we do.
117: */
118: if (mp->mnt_flag & MNT_UPDATE) {
119: pmp = VFSTOMSDOSFS(mp);
120: error = 0;
121: if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) {
122: flags = WRITECLOSE;
123: if (mp->mnt_flag & MNT_FORCE)
124: flags |= FORCECLOSE;
125: error = vflush(mp, NULLVP, flags);
126: }
127: if (!error && (mp->mnt_flag & MNT_RELOAD))
128: /* not yet implemented */
129: error = EOPNOTSUPP;
130: if (error)
131: return (error);
132: if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_WANTRDWR)) {
133: /*
134: * If upgrade to read-write by non-root, then verify
135: * that user has necessary permissions on the device.
136: */
137: if (p->p_ucred->cr_uid != 0) {
138: devvp = pmp->pm_devvp;
139: vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
140: error = VOP_ACCESS(devvp, VREAD | VWRITE,
141: p->p_ucred, p);
142: if (error) {
143: VOP_UNLOCK(devvp, 0, p);
144: return (error);
145: }
146: VOP_UNLOCK(devvp, 0, p);
147: }
148: pmp->pm_flags &= ~MSDOSFSMNT_RONLY;
149: }
150: if (args.fspec == 0) {
151: #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */
152: if (args.flags & MSDOSFSMNT_MNTOPT) {
153: pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT;
154: pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT;
155: if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
156: pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
157: }
158: #endif
159: /*
160: * Process export requests.
161: */
162: return (vfs_export(mp, &pmp->pm_export,
163: &args.export_info));
164: }
165: }
166: /*
167: * Not an update, or updating the name: look up the name
168: * and verify that it refers to a sensible block device.
169: */
170: NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
171: if ((error = namei(ndp)) != 0)
172: return (error);
173: devvp = ndp->ni_vp;
174:
175: if (devvp->v_type != VBLK) {
176: vrele(devvp);
177: return (ENOTBLK);
178: }
179: if (major(devvp->v_rdev) >= nblkdev) {
180: vrele(devvp);
181: return (ENXIO);
182: }
183: /*
184: * If mount by non-root, then verify that user has necessary
185: * permissions on the device.
186: */
187: if (p->p_ucred->cr_uid != 0) {
188: accessmode = VREAD;
189: if ((mp->mnt_flag & MNT_RDONLY) == 0)
190: accessmode |= VWRITE;
191: vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
192: error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p);
193: if (error) {
194: vput(devvp);
195: return (error);
196: }
197: VOP_UNLOCK(devvp, 0, p);
198: }
199: if ((mp->mnt_flag & MNT_UPDATE) == 0)
200: error = msdosfs_mountfs(devvp, mp, p, &args);
201: else {
202: if (devvp != pmp->pm_devvp)
203: error = EINVAL; /* XXX needs translation */
204: else
205: vrele(devvp);
206: }
207: if (error) {
208: vrele(devvp);
209: return (error);
210: }
211: pmp = VFSTOMSDOSFS(mp);
212: pmp->pm_gid = args.gid;
213: pmp->pm_uid = args.uid;
214: pmp->pm_mask = args.mask;
215: pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT;
216:
217: if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
218: pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
219: else if (!(pmp->pm_flags & (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) {
220: struct vnode *rvp;
221:
222: /*
223: * Try to divine whether to support Win'95 long filenames
224: */
225: if (FAT32(pmp))
226: pmp->pm_flags |= MSDOSFSMNT_LONGNAME;
227: else {
228: if ((error = msdosfs_root(mp, &rvp)) != 0) {
229: msdosfs_unmount(mp, MNT_FORCE, p);
230: return (error);
231: }
232: pmp->pm_flags |= findwin95(VTODE(rvp))
233: ? MSDOSFSMNT_LONGNAME
234: : MSDOSFSMNT_SHORTNAME;
235: vput(rvp);
236: }
237: }
238: (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
239: bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
240: (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
241: &size);
242: bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
243: bcopy(&args, &mp->mnt_stat.mount_info.msdosfs_args, sizeof(args));
244: #ifdef MSDOSFS_DEBUG
245: printf("msdosfs_mount(): mp %x, pmp %x, inusemap %x\n", mp, pmp, pmp->pm_inusemap);
246: #endif
247: return (0);
248: }
249:
250: int
251: msdosfs_mountfs(devvp, mp, p, argp)
252: struct vnode *devvp;
253: struct mount *mp;
254: struct proc *p;
255: struct msdosfs_args *argp;
256: {
257: struct msdosfsmount *pmp;
258: struct buf *bp;
259: dev_t dev = devvp->v_rdev;
260: union bootsector *bsp;
261: struct byte_bpb33 *b33;
262: struct byte_bpb50 *b50;
263: struct byte_bpb710 *b710;
264: extern struct vnode *rootvp;
265: u_int8_t SecPerClust;
266: int ronly, error, bmapsiz;
267: uint32_t fat_max_clusters;
268:
269: /*
270: * Disallow multiple mounts of the same device.
271: * Disallow mounting of a device that is currently in use
272: * (except for root, which might share swap device for miniroot).
273: * Flush out any old buffers remaining from a previous use.
274: */
275: if ((error = vfs_mountedon(devvp)) != 0)
276: return (error);
277: if (vcount(devvp) > 1 && devvp != rootvp)
278: return (EBUSY);
279: vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
280: error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0);
281: VOP_UNLOCK(devvp, 0, p);
282: if (error)
283: return (error);
284:
285: ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
286: error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p);
287: if (error)
288: return (error);
289:
290: bp = NULL; /* both used in error_exit */
291: pmp = NULL;
292:
293: /*
294: * Read the boot sector of the filesystem, and then check the
295: * boot signature. If not a dos boot sector then error out.
296: */
297: if ((error = bread(devvp, 0, 2048, NOCRED, &bp)) != 0)
298: goto error_exit;
299: bp->b_flags |= B_AGE;
300: bsp = (union bootsector *)bp->b_data;
301: b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB;
302: b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB;
303: b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP;
304:
305: pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK);
306: bzero((caddr_t)pmp, sizeof *pmp);
307: pmp->pm_mountp = mp;
308:
309: /*
310: * Compute several useful quantities from the bpb in the
311: * bootsector. Copy in the dos 5 variant of the bpb then fix up
312: * the fields that are different between dos 5 and dos 3.3.
313: */
314: SecPerClust = b50->bpbSecPerClust;
315: pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec);
316: pmp->pm_ResSectors = getushort(b50->bpbResSectors);
317: pmp->pm_FATs = b50->bpbFATs;
318: pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts);
319: pmp->pm_Sectors = getushort(b50->bpbSectors);
320: pmp->pm_FATsecs = getushort(b50->bpbFATsecs);
321: pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack);
322: pmp->pm_Heads = getushort(b50->bpbHeads);
323: pmp->pm_Media = b50->bpbMedia;
324:
325: /* Determine the number of DEV_BSIZE blocks in a MSDOSFS sector */
326: pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE;
327:
328: if (!pmp->pm_BytesPerSec || !SecPerClust || pmp->pm_SecPerTrack > 63) {
329: error = EFTYPE;
330: goto error_exit;
331: }
332:
333: if (pmp->pm_Sectors == 0) {
334: pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs);
335: pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors);
336: } else {
337: pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs);
338: pmp->pm_HugeSectors = pmp->pm_Sectors;
339: }
340:
341: if (pmp->pm_RootDirEnts == 0) {
342: if (pmp->pm_Sectors || pmp->pm_FATsecs ||
343: getushort(b710->bpbFSVers)) {
344: error = EINVAL;
345: goto error_exit;
346: }
347: pmp->pm_fatmask = FAT32_MASK;
348: pmp->pm_fatmult = 4;
349: pmp->pm_fatdiv = 1;
350: pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs);
351: if (getushort(b710->bpbExtFlags) & FATMIRROR)
352: pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM;
353: else
354: pmp->pm_flags |= MSDOSFS_FATMIRROR;
355: } else
356: pmp->pm_flags |= MSDOSFS_FATMIRROR;
357:
358: /*
359: * More sanity checks:
360: * MSDOSFS sectors per cluster: >0 && power of 2
361: * MSDOSFS sector size: >= DEV_BSIZE && power of 2
362: * HUGE sector count: >0
363: * FAT sectors: >0
364: */
365: if ((SecPerClust == 0) || (SecPerClust & (SecPerClust - 1)) ||
366: (pmp->pm_BytesPerSec < DEV_BSIZE) ||
367: (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) ||
368: (pmp->pm_HugeSectors == 0) || (pmp->pm_FATsecs == 0)) {
369: error = EINVAL;
370: goto error_exit;
371: }
372:
373: pmp->pm_HugeSectors *= pmp->pm_BlkPerSec;
374: pmp->pm_HiddenSects *= pmp->pm_BlkPerSec;
375: pmp->pm_FATsecs *= pmp->pm_BlkPerSec;
376: pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec;
377: SecPerClust *= pmp->pm_BlkPerSec;
378:
379: if (FAT32(pmp)) {
380: pmp->pm_rootdirblk = getulong(b710->bpbRootClust);
381: pmp->pm_firstcluster = pmp->pm_fatblk
382: + (pmp->pm_FATs * pmp->pm_FATsecs);
383: pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec;
384: } else {
385: pmp->pm_rootdirblk = pmp->pm_fatblk +
386: (pmp->pm_FATs * pmp->pm_FATsecs);
387: pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry)
388: + DEV_BSIZE - 1) / DEV_BSIZE;
389: pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize;
390: }
391:
392: pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) /
393: SecPerClust;
394: pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1;
395: pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE;
396:
397: if (pmp->pm_fatmask == 0) {
398: if (pmp->pm_maxcluster
399: <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) {
400: /*
401: * This will usually be a floppy disk. This size makes
402: * sure that one fat entry will not be split across
403: * multiple blocks.
404: */
405: pmp->pm_fatmask = FAT12_MASK;
406: pmp->pm_fatmult = 3;
407: pmp->pm_fatdiv = 2;
408: } else {
409: pmp->pm_fatmask = FAT16_MASK;
410: pmp->pm_fatmult = 2;
411: pmp->pm_fatdiv = 1;
412: }
413: }
414: if (FAT12(pmp))
415: pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec;
416: else
417: pmp->pm_fatblocksize = MAXBSIZE;
418:
419: /*
420: * We now have the number of sectors in each FAT, so can work
421: * out how many clusters can be represented in a FAT. Let's
422: * make sure the file system doesn't claim to have more clusters
423: * than this.
424: *
425: * We perform the calculation like we do to avoid integer overflow.
426: *
427: * This will give us a count of clusters. They are numbered
428: * from 0, so the max cluster value is one less than the value
429: * we end up with.
430: */
431: fat_max_clusters = pmp->pm_fatsize / pmp->pm_fatmult;
432: fat_max_clusters *= pmp->pm_fatdiv;
433: if (pmp->pm_maxcluster >= fat_max_clusters) {
434: #ifndef SMALL_KERNEL
435: printf("msdosfs: reducing max cluster to %d from %d "
436: "due to FAT size\n", fat_max_clusters - 1,
437: pmp->pm_maxcluster);
438: #endif
439: pmp->pm_maxcluster = fat_max_clusters - 1;
440: }
441:
442: pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE;
443: pmp->pm_bnshift = ffs(DEV_BSIZE) - 1;
444:
445: /*
446: * Compute mask and shift value for isolating cluster relative byte
447: * offsets and cluster numbers from a file offset.
448: */
449: pmp->pm_bpcluster = SecPerClust * DEV_BSIZE;
450: pmp->pm_crbomask = pmp->pm_bpcluster - 1;
451: pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1;
452:
453: /*
454: * Check for valid cluster size
455: * must be a power of 2
456: */
457: if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) {
458: error = EFTYPE;
459: goto error_exit;
460: }
461:
462: /*
463: * Release the bootsector buffer.
464: */
465: brelse(bp);
466: bp = NULL;
467:
468: /*
469: * Check FSInfo
470: */
471: if (pmp->pm_fsinfo) {
472: struct fsinfo *fp;
473:
474: if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp),
475: NOCRED, &bp)) != 0)
476: goto error_exit;
477: fp = (struct fsinfo *)bp->b_data;
478: if (!bcmp(fp->fsisig1, "RRaA", 4)
479: && !bcmp(fp->fsisig2, "rrAa", 4)
480: && !bcmp(fp->fsisig3, "\0\0\125\252", 4)
481: && !bcmp(fp->fsisig4, "\0\0\125\252", 4))
482: pmp->pm_nxtfree = getulong(fp->fsinxtfree);
483: else
484: pmp->pm_fsinfo = 0;
485: brelse(bp);
486: bp = NULL;
487: }
488:
489: /*
490: * Check and validate (or perhaps invalidate?) the fsinfo structure? XXX
491: */
492:
493: /*
494: * Allocate memory for the bitmap of allocated clusters, and then
495: * fill it in.
496: */
497: bmapsiz = (pmp->pm_maxcluster + N_INUSEBITS - 1) / N_INUSEBITS;
498: if (bmapsiz == 0 || SIZE_MAX / bmapsiz < sizeof(*pmp->pm_inusemap)) {
499: /* detect multiplicative integer overflow */
500: error = EINVAL;
501: goto error_exit;
502: }
503: pmp->pm_inusemap = malloc(bmapsiz * sizeof(*pmp->pm_inusemap),
504: M_MSDOSFSFAT, M_WAITOK | M_CANFAIL);
505: if (pmp->pm_inusemap == NULL) {
506: error = EINVAL;
507: goto error_exit;
508: }
509:
510: /*
511: * fillinusemap() needs pm_devvp.
512: */
513: pmp->pm_dev = dev;
514: pmp->pm_devvp = devvp;
515:
516: /*
517: * Have the inuse map filled in.
518: */
519: if ((error = fillinusemap(pmp)) != 0)
520: goto error_exit;
521:
522: /*
523: * If they want fat updates to be synchronous then let them suffer
524: * the performance degradation in exchange for the on disk copy of
525: * the fat being correct just about all the time. I suppose this
526: * would be a good thing to turn on if the kernel is still flakey.
527: */
528: if (mp->mnt_flag & MNT_SYNCHRONOUS)
529: pmp->pm_flags |= MSDOSFSMNT_WAITONFAT;
530:
531: /*
532: * Finish up.
533: */
534: if (ronly)
535: pmp->pm_flags |= MSDOSFSMNT_RONLY;
536: else
537: pmp->pm_fmod = 1;
538: mp->mnt_data = (qaddr_t)pmp;
539: mp->mnt_stat.f_fsid.val[0] = (long)dev;
540: mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
541: #ifdef QUOTA
542: /*
543: * If we ever do quotas for DOS filesystems this would be a place
544: * to fill in the info in the msdosfsmount structure. You dolt,
545: * quotas on dos filesystems make no sense because files have no
546: * owners on dos filesystems. of course there is some empty space
547: * in the directory entry where we could put uid's and gid's.
548: */
549: #endif
550: devvp->v_specmountpoint = mp;
551:
552: return (0);
553:
554: error_exit:
555: devvp->v_specmountpoint = NULL;
556: if (bp)
557: brelse(bp);
558: (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
559: if (pmp) {
560: if (pmp->pm_inusemap)
561: free(pmp->pm_inusemap, M_MSDOSFSFAT);
562: free(pmp, M_MSDOSFSMNT);
563: mp->mnt_data = (qaddr_t)0;
564: }
565: return (error);
566: }
567:
568: int
569: msdosfs_start(mp, flags, p)
570: struct mount *mp;
571: int flags;
572: struct proc *p;
573: {
574:
575: return (0);
576: }
577:
578: /*
579: * Unmount the filesystem described by mp.
580: */
581: int
582: msdosfs_unmount(mp, mntflags, p)
583: struct mount *mp;
584: int mntflags;
585: struct proc *p;
586: {
587: struct msdosfsmount *pmp;
588: int error, flags;
589: struct vnode *vp;
590:
591: flags = 0;
592: if (mntflags & MNT_FORCE)
593: flags |= FORCECLOSE;
594: #ifdef QUOTA
595: #endif
596: if ((error = vflush(mp, NULLVP, flags)) != 0)
597: return (error);
598: pmp = VFSTOMSDOSFS(mp);
599: pmp->pm_devvp->v_specmountpoint = NULL;
600: vp = pmp->pm_devvp;
601: #ifdef MSDOSFS_DEBUG
602: vprint("msdosfs_umount(): just before calling VOP_CLOSE()\n", vp);
603: #endif
604: error = VOP_CLOSE(vp,
605: pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, p);
606: vrele(vp);
607: free(pmp->pm_inusemap, M_MSDOSFSFAT);
608: free(pmp, M_MSDOSFSMNT);
609: mp->mnt_data = (qaddr_t)0;
610: mp->mnt_flag &= ~MNT_LOCAL;
611: return (error);
612: }
613:
614: int
615: msdosfs_root(mp, vpp)
616: struct mount *mp;
617: struct vnode **vpp;
618: {
619: struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
620: struct denode *ndep;
621: int error;
622:
623: if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0)
624: return (error);
625:
626: #ifdef MSDOSFS_DEBUG
627: printf("msdosfs_root(); mp %08x, pmp %08x, ndep %08x, vp %08x\n",
628: mp, pmp, ndep, DETOV(ndep));
629: #endif
630:
631: *vpp = DETOV(ndep);
632: return (0);
633: }
634:
635: int
636: msdosfs_statfs(mp, sbp, p)
637: struct mount *mp;
638: struct statfs *sbp;
639: struct proc *p;
640: {
641: struct msdosfsmount *pmp;
642:
643: pmp = VFSTOMSDOSFS(mp);
644: sbp->f_bsize = pmp->pm_bpcluster;
645: sbp->f_iosize = pmp->pm_bpcluster;
646: sbp->f_blocks = pmp->pm_nmbrofclusters;
647: sbp->f_bfree = pmp->pm_freeclustercount;
648: sbp->f_bavail = pmp->pm_freeclustercount;
649: sbp->f_files = pmp->pm_RootDirEnts; /* XXX */
650: sbp->f_ffree = 0; /* what to put in here? */
651: if (sbp != &mp->mnt_stat) {
652: bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
653: bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
654: bcopy(&mp->mnt_stat.mount_info.msdosfs_args,
655: &sbp->mount_info.msdosfs_args, sizeof(struct msdosfs_args));
656: }
657: strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN);
658: return (0);
659: }
660:
661:
662: struct msdosfs_sync_arg {
663: struct proc *p;
664: struct ucred *cred;
665: int allerror;
666: int waitfor;
667: };
668:
669: int
670: msdosfs_sync_vnode(struct vnode *vp, void *arg)
671: {
672: struct msdosfs_sync_arg *msa = arg;
673: int error;
674: struct denode *dep;
675:
676: dep = VTODE(vp);
677: if (vp->v_type == VNON ||
678: ((dep->de_flag & (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0
679: && LIST_EMPTY(&vp->v_dirtyblkhd)) ||
680: msa->waitfor == MNT_LAZY) {
681: return (0);
682: }
683:
684: if (vget(vp, LK_EXCLUSIVE | LK_NOWAIT, msa->p))
685: return (0);
686:
687: if ((error = VOP_FSYNC(vp, msa->cred, msa->waitfor, msa->p)) != 0)
688: msa->allerror = error;
689: VOP_UNLOCK(vp, 0, msa->p);
690: vrele(vp);
691:
692: return (0);
693: }
694:
695:
696: int
697: msdosfs_sync(mp, waitfor, cred, p)
698: struct mount *mp;
699: int waitfor;
700: struct ucred *cred;
701: struct proc *p;
702: {
703: struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
704: struct msdosfs_sync_arg msa;
705: int error;
706:
707: msa.allerror = 0;
708: msa.p = p;
709: msa.cred = cred;
710: msa.waitfor = waitfor;
711:
712: /*
713: * If we ever switch to not updating all of the fats all the time,
714: * this would be the place to update them from the first one.
715: */
716: if (pmp->pm_fmod != 0) {
717: if (pmp->pm_flags & MSDOSFSMNT_RONLY)
718: panic("msdosfs_sync: rofs mod");
719: else {
720: /* update fats here */
721: }
722: }
723: /*
724: * Write back each (modified) denode.
725: */
726: vfs_mount_foreach_vnode(mp, msdosfs_sync_vnode, &msa);
727:
728: /*
729: * Force stale file system control information to be flushed.
730: */
731: if (waitfor != MNT_LAZY) {
732: vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, p);
733: if ((error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, p)) != 0)
734: msa.allerror = error;
735: VOP_UNLOCK(pmp->pm_devvp, 0, p);
736: }
737:
738: return (msa.allerror);
739: }
740:
741: int
742: msdosfs_fhtovp(mp, fhp, vpp)
743: struct mount *mp;
744: struct fid *fhp;
745: struct vnode **vpp;
746: {
747: struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
748: struct defid *defhp = (struct defid *) fhp;
749: struct denode *dep;
750: int error;
751:
752: error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep);
753: if (error) {
754: *vpp = NULLVP;
755: return (error);
756: }
757: *vpp = DETOV(dep);
758: return (0);
759: }
760:
761: int
762: msdosfs_vptofh(vp, fhp)
763: struct vnode *vp;
764: struct fid *fhp;
765: {
766: struct denode *dep;
767: struct defid *defhp;
768:
769: dep = VTODE(vp);
770: defhp = (struct defid *)fhp;
771: defhp->defid_len = sizeof(struct defid);
772: defhp->defid_dirclust = dep->de_dirclust;
773: defhp->defid_dirofs = dep->de_diroffset;
774: /* defhp->defid_gen = dep->de_gen; */
775: return (0);
776: }
777:
778: int
779: msdosfs_check_export(mp, nam, exflagsp, credanonp)
780: register struct mount *mp;
781: struct mbuf *nam;
782: int *exflagsp;
783: struct ucred **credanonp;
784: {
785: register struct netcred *np;
786: register struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
787:
788: /*
789: * Get the export permission structure for this <mp, client> tuple.
790: */
791: np = vfs_export_lookup(mp, &pmp->pm_export, nam);
792: if (np == NULL)
793: return (EACCES);
794:
795: *exflagsp = np->netc_exflags;
796: *credanonp = &np->netc_anon;
797: return (0);
798: }
799:
800: #define msdosfs_vget ((int (*)(struct mount *, ino_t, struct vnode **)) \
801: eopnotsupp)
802:
803: #define msdosfs_quotactl ((int (*)(struct mount *, int, uid_t, caddr_t, \
804: struct proc *))eopnotsupp)
805:
806: #define msdosfs_sysctl ((int (*)(int *, u_int, void *, size_t *, void *, \
807: size_t, struct proc *))eopnotsupp)
808:
809: const struct vfsops msdosfs_vfsops = {
810: msdosfs_mount,
811: msdosfs_start,
812: msdosfs_unmount,
813: msdosfs_root,
814: msdosfs_quotactl,
815: msdosfs_statfs,
816: msdosfs_sync,
817: msdosfs_vget,
818: msdosfs_fhtovp,
819: msdosfs_vptofh,
820: msdosfs_init,
821: msdosfs_sysctl,
822: msdosfs_check_export
823: };
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