Annotation of src/sys/fs/msdosfs/msdosfs_vfsops.c, Revision 1.13.2.2
1.13.2.2! he 1: /* $NetBSD: msdosfs_vfsops.c,v 1.13.2.1 2004/05/29 09:03:48 tron Exp $ */
1.1 jdolecek 2:
3: /*-
4: * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
5: * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
6: * All rights reserved.
7: * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
8: *
9: * Redistribution and use in source and binary forms, with or without
10: * modification, are permitted provided that the following conditions
11: * are met:
12: * 1. Redistributions of source code must retain the above copyright
13: * notice, this list of conditions and the following disclaimer.
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in the
16: * documentation and/or other materials provided with the distribution.
17: * 3. All advertising materials mentioning features or use of this software
18: * must display the following acknowledgement:
19: * This product includes software developed by TooLs GmbH.
20: * 4. The name of TooLs GmbH may not be used to endorse or promote products
21: * derived from this software without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
24: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26: * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
28: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
29: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
30: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
31: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
32: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33: */
34: /*
35: * Written by Paul Popelka (paulp@uts.amdahl.com)
36: *
37: * You can do anything you want with this software, just don't say you wrote
38: * it, and don't remove this notice.
39: *
40: * This software is provided "as is".
41: *
42: * The author supplies this software to be publicly redistributed on the
43: * understanding that the author is not responsible for the correct
44: * functioning of this software in any circumstances and is not liable for
45: * any damages caused by this software.
46: *
47: * October 1992
48: */
49:
50: #include <sys/cdefs.h>
1.13.2.2! he 51: __KERNEL_RCSID(0, "$NetBSD: msdosfs_vfsops.c,v 1.13.2.1 2004/05/29 09:03:48 tron Exp $");
1.1 jdolecek 52:
53: #if defined(_KERNEL_OPT)
54: #include "opt_quota.h"
55: #include "opt_compat_netbsd.h"
56: #endif
57:
58: #include <sys/param.h>
59: #include <sys/systm.h>
1.12 atatat 60: #include <sys/sysctl.h>
1.1 jdolecek 61: #include <sys/namei.h>
62: #include <sys/proc.h>
63: #include <sys/kernel.h>
64: #include <sys/vnode.h>
65: #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */
66: #include <sys/mount.h>
67: #include <sys/buf.h>
68: #include <sys/file.h>
69: #include <sys/device.h>
70: #include <sys/disklabel.h>
71: #include <sys/ioctl.h>
72: #include <sys/malloc.h>
73: #include <sys/dirent.h>
74: #include <sys/stat.h>
75: #include <sys/conf.h>
76:
77: #include <fs/msdosfs/bpb.h>
78: #include <fs/msdosfs/bootsect.h>
79: #include <fs/msdosfs/direntry.h>
80: #include <fs/msdosfs/denode.h>
81: #include <fs/msdosfs/msdosfsmount.h>
82: #include <fs/msdosfs/fat.h>
83:
84: int msdosfs_mountroot __P((void));
85: int msdosfs_mount __P((struct mount *, const char *, void *,
1.7 fvdl 86: struct nameidata *, struct proc *));
87: int msdosfs_start __P((struct mount *, int, struct proc *));
88: int msdosfs_unmount __P((struct mount *, int, struct proc *));
1.6 thorpej 89: int msdosfs_root __P((struct mount *, struct vnode **));
1.7 fvdl 90: int msdosfs_quotactl __P((struct mount *, int, uid_t, caddr_t, struct proc *));
91: int msdosfs_statfs __P((struct mount *, struct statfs *, struct proc *));
92: int msdosfs_sync __P((struct mount *, int, struct ucred *, struct proc *));
1.6 thorpej 93: int msdosfs_vget __P((struct mount *, ino_t, struct vnode **));
94: int msdosfs_fhtovp __P((struct mount *, struct fid *, struct vnode **));
1.1 jdolecek 95: int msdosfs_checkexp __P((struct mount *, struct mbuf *, int *,
96: struct ucred **));
97: int msdosfs_vptofh __P((struct vnode *, struct fid *));
98:
1.7 fvdl 99: int msdosfs_mountfs __P((struct vnode *, struct mount *, struct proc *,
1.1 jdolecek 100: struct msdosfs_args *));
101:
1.6 thorpej 102: static int update_mp __P((struct mount *, struct msdosfs_args *));
1.2 thorpej 103:
104: MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOS FS mount structure");
105: MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS fat", "MSDOS FS fat table");
1.1 jdolecek 106:
107: #define ROOTNAME "root_device"
108:
109: extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc;
110:
111: const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = {
112: &msdosfs_vnodeop_opv_desc,
113: NULL,
114: };
115:
116: struct vfsops msdosfs_vfsops = {
117: MOUNT_MSDOS,
118: msdosfs_mount,
119: msdosfs_start,
120: msdosfs_unmount,
121: msdosfs_root,
122: msdosfs_quotactl,
123: msdosfs_statfs,
124: msdosfs_sync,
125: msdosfs_vget,
126: msdosfs_fhtovp,
127: msdosfs_vptofh,
128: msdosfs_init,
129: msdosfs_reinit,
130: msdosfs_done,
1.12 atatat 131: NULL,
1.1 jdolecek 132: msdosfs_mountroot,
133: msdosfs_checkexp,
134: msdosfs_vnodeopv_descs,
135: };
136:
137: static int
1.6 thorpej 138: update_mp(mp, argp)
1.1 jdolecek 139: struct mount *mp;
140: struct msdosfs_args *argp;
141: {
142: struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
143: int error;
144:
145: pmp->pm_gid = argp->gid;
146: pmp->pm_uid = argp->uid;
147: pmp->pm_mask = argp->mask & ALLPERMS;
1.8 jdolecek 148: pmp->pm_dirmask = argp->dirmask & ALLPERMS;
1.9 itojun 149: pmp->pm_gmtoff = argp->gmtoff;
1.1 jdolecek 150: pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT;
151:
152: /*
153: * GEMDOS knows nothing (yet) about win95
154: */
155: if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS)
156: pmp->pm_flags |= MSDOSFSMNT_NOWIN95;
157:
158: if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
159: pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
160: else if (!(pmp->pm_flags &
161: (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) {
162: struct vnode *rootvp;
163:
164: /*
165: * Try to divine whether to support Win'95 long filenames
166: */
167: if (FAT32(pmp))
168: pmp->pm_flags |= MSDOSFSMNT_LONGNAME;
169: else {
1.6 thorpej 170: if ((error = msdosfs_root(mp, &rootvp)) != 0)
1.1 jdolecek 171: return error;
172: pmp->pm_flags |= findwin95(VTODE(rootvp))
173: ? MSDOSFSMNT_LONGNAME
174: : MSDOSFSMNT_SHORTNAME;
175: vput(rootvp);
176: }
177: }
178: return 0;
179: }
180:
181: int
182: msdosfs_mountroot()
183: {
184: struct mount *mp;
1.7 fvdl 185: struct proc *p = curproc; /* XXX */
1.1 jdolecek 186: int error;
187: struct msdosfs_args args;
188:
189: if (root_device->dv_class != DV_DISK)
190: return (ENODEV);
191:
192: /*
193: * Get vnodes for swapdev and rootdev.
194: */
195: if (bdevvp(rootdev, &rootvp))
196: panic("msdosfs_mountroot: can't setup rootvp");
197:
198: if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) {
199: vrele(rootvp);
200: return (error);
201: }
202:
1.8 jdolecek 203: args.flags = MSDOSFSMNT_VERSIONED;
1.1 jdolecek 204: args.uid = 0;
205: args.gid = 0;
206: args.mask = 0777;
1.8 jdolecek 207: args.version = MSDOSFSMNT_VERSION;
208: args.dirmask = 0777;
1.1 jdolecek 209:
1.7 fvdl 210: if ((error = msdosfs_mountfs(rootvp, mp, p, &args)) != 0) {
1.1 jdolecek 211: mp->mnt_op->vfs_refcount--;
212: vfs_unbusy(mp);
213: free(mp, M_MOUNT);
214: vrele(rootvp);
215: return (error);
216: }
217:
1.6 thorpej 218: if ((error = update_mp(mp, &args)) != 0) {
1.7 fvdl 219: (void)msdosfs_unmount(mp, 0, p);
1.1 jdolecek 220: vfs_unbusy(mp);
221: free(mp, M_MOUNT);
222: vrele(rootvp);
223: return (error);
224: }
225:
226: simple_lock(&mountlist_slock);
227: CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
228: simple_unlock(&mountlist_slock);
1.7 fvdl 229: (void)msdosfs_statfs(mp, &mp->mnt_stat, p);
1.1 jdolecek 230: vfs_unbusy(mp);
231: return (0);
232: }
233:
234: /*
235: * mp - path - addr in user space of mount point (ie /usr or whatever)
236: * data - addr in user space of mount params including the name of the block
237: * special file to treat as a filesystem.
238: */
239: int
1.7 fvdl 240: msdosfs_mount(mp, path, data, ndp, p)
1.1 jdolecek 241: struct mount *mp;
242: const char *path;
243: void *data;
244: struct nameidata *ndp;
1.7 fvdl 245: struct proc *p;
1.1 jdolecek 246: {
247: struct vnode *devvp; /* vnode for blk device to mount */
248: struct msdosfs_args args; /* will hold data from mount request */
249: /* msdosfs specific mount control block */
250: struct msdosfsmount *pmp = NULL;
251: int error, flags;
252: mode_t accessmode;
253:
254: if (mp->mnt_flag & MNT_GETARGS) {
255: pmp = VFSTOMSDOSFS(mp);
256: if (pmp == NULL)
257: return EIO;
258: args.fspec = NULL;
259: args.uid = pmp->pm_uid;
260: args.gid = pmp->pm_gid;
261: args.mask = pmp->pm_mask;
262: args.flags = pmp->pm_flags;
1.8 jdolecek 263: args.version = MSDOSFSMNT_VERSION;
264: args.dirmask = pmp->pm_dirmask;
1.13.2.2! he 265: args.gmtoff = pmp->pm_gmtoff;
1.1 jdolecek 266: vfs_showexport(mp, &args.export, &pmp->pm_export);
267: return copyout(&args, data, sizeof(args));
268: }
1.3 dsl 269: error = copyin(data, &args, sizeof(struct msdosfs_args));
1.1 jdolecek 270: if (error)
271: return (error);
1.8 jdolecek 272:
273: /*
274: * If not versioned (i.e. using old mount_msdos(8)), fill in
275: * the additional structure items with suitable defaults.
276: */
277: if ((args.flags & MSDOSFSMNT_VERSIONED) == 0) {
278: args.version = 1;
279: args.dirmask = args.mask;
280: }
281:
1.1 jdolecek 282: /*
283: * If updating, check whether changing from read-only to
284: * read/write; if there is no device name, that's all we do.
285: */
286: if (mp->mnt_flag & MNT_UPDATE) {
287: pmp = VFSTOMSDOSFS(mp);
288: error = 0;
289: if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) {
290: flags = WRITECLOSE;
291: if (mp->mnt_flag & MNT_FORCE)
292: flags |= FORCECLOSE;
293: error = vflush(mp, NULLVP, flags);
294: }
295: if (!error && (mp->mnt_flag & MNT_RELOAD))
296: /* not yet implemented */
297: error = EOPNOTSUPP;
298: if (error)
299: return (error);
1.11 dbj 300: if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_iflag & IMNT_WANTRDWR)) {
1.1 jdolecek 301: /*
302: * If upgrade to read-write by non-root, then verify
303: * that user has necessary permissions on the device.
304: */
305: if (p->p_ucred->cr_uid != 0) {
306: devvp = pmp->pm_devvp;
307: vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
308: error = VOP_ACCESS(devvp, VREAD | VWRITE,
1.7 fvdl 309: p->p_ucred, p);
1.1 jdolecek 310: VOP_UNLOCK(devvp, 0);
311: if (error)
312: return (error);
313: }
314: pmp->pm_flags &= ~MSDOSFSMNT_RONLY;
315: }
316: if (args.fspec == 0) {
317: #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */
318: if (args.flags & MSDOSFSMNT_MNTOPT) {
319: pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT;
320: pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT;
321: if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
322: pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
323: }
324: #endif
325: /*
326: * Process export requests.
327: */
328: return (vfs_export(mp, &pmp->pm_export, &args.export));
329: }
330: }
331: /*
332: * Not an update, or updating the name: look up the name
333: * and verify that it refers to a sensible block device.
334: */
1.7 fvdl 335: NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
1.1 jdolecek 336: if ((error = namei(ndp)) != 0)
337: return (error);
338: devvp = ndp->ni_vp;
339:
340: if (devvp->v_type != VBLK) {
341: vrele(devvp);
342: return (ENOTBLK);
343: }
344: if (bdevsw_lookup(devvp->v_rdev) == NULL) {
345: vrele(devvp);
346: return (ENXIO);
347: }
348: /*
349: * If mount by non-root, then verify that user has necessary
350: * permissions on the device.
351: */
352: if (p->p_ucred->cr_uid != 0) {
353: accessmode = VREAD;
354: if ((mp->mnt_flag & MNT_RDONLY) == 0)
355: accessmode |= VWRITE;
356: vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1.7 fvdl 357: error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p);
1.1 jdolecek 358: VOP_UNLOCK(devvp, 0);
359: if (error) {
360: vrele(devvp);
361: return (error);
362: }
363: }
364: if ((mp->mnt_flag & MNT_UPDATE) == 0) {
1.7 fvdl 365: error = msdosfs_mountfs(devvp, mp, p, &args);
1.1 jdolecek 366: #ifdef MSDOSFS_DEBUG /* only needed for the printf below */
367: pmp = VFSTOMSDOSFS(mp);
368: #endif
369: } else {
370: if (devvp != pmp->pm_devvp)
371: error = EINVAL; /* needs translation */
372: else
373: vrele(devvp);
374: }
375: if (error) {
376: vrele(devvp);
377: return (error);
378: }
379:
1.6 thorpej 380: if ((error = update_mp(mp, &args)) != 0) {
1.7 fvdl 381: msdosfs_unmount(mp, MNT_FORCE, p);
1.1 jdolecek 382: return error;
383: }
384:
385: #ifdef MSDOSFS_DEBUG
386: printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap);
387: #endif
1.4 christos 388: return set_statfs_info(path, UIO_USERSPACE, args.fspec, UIO_USERSPACE,
1.7 fvdl 389: mp, p);
1.1 jdolecek 390: }
391:
392: int
1.7 fvdl 393: msdosfs_mountfs(devvp, mp, p, argp)
1.1 jdolecek 394: struct vnode *devvp;
395: struct mount *mp;
1.7 fvdl 396: struct proc *p;
1.1 jdolecek 397: struct msdosfs_args *argp;
398: {
399: struct msdosfsmount *pmp;
400: struct buf *bp;
401: dev_t dev = devvp->v_rdev;
402: struct partinfo dpart;
403: union bootsector *bsp;
404: struct byte_bpb33 *b33;
405: struct byte_bpb50 *b50;
406: struct byte_bpb710 *b710;
407: u_int8_t SecPerClust;
408: int ronly, error;
409: int bsize = 0, dtype = 0, tmp;
410: u_long dirsperblk;
411:
412: /*
413: * Disallow multiple mounts of the same device.
414: * Disallow mounting of a device that is currently in use
415: * (except for root, which might share swap device for miniroot).
416: * Flush out any old buffers remaining from a previous use.
417: */
418: if ((error = vfs_mountedon(devvp)) != 0)
419: return (error);
420: if (vcount(devvp) > 1 && devvp != rootvp)
421: return (EBUSY);
1.7 fvdl 422: if ((error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)) != 0)
1.1 jdolecek 423: return (error);
424:
425: ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
1.7 fvdl 426: error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p);
1.1 jdolecek 427: if (error)
428: return (error);
429:
430: bp = NULL; /* both used in error_exit */
431: pmp = NULL;
432:
433: if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
434: /*
435: * We need the disklabel to calculate the size of a FAT entry
436: * later on. Also make sure the partition contains a filesystem
437: * of type FS_MSDOS. This doesn't work for floppies, so we have
438: * to check for them too.
439: *
440: * At least some parts of the msdos fs driver seem to assume
441: * that the size of a disk block will always be 512 bytes.
442: * Let's check it...
443: */
1.7 fvdl 444: error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED, p);
1.1 jdolecek 445: if (error)
446: goto error_exit;
447: tmp = dpart.part->p_fstype;
448: dtype = dpart.disklab->d_type;
449: bsize = dpart.disklab->d_secsize;
450: if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) {
451: error = EINVAL;
452: goto error_exit;
453: }
454: }
455:
456: /*
457: * Read the boot sector of the filesystem, and then check the
458: * boot signature. If not a dos boot sector then error out.
459: */
460: if ((error = bread(devvp, 0, 512, NOCRED, &bp)) != 0)
461: goto error_exit;
462: bp->b_flags |= B_AGE;
463: bsp = (union bootsector *)bp->b_data;
464: b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB;
465: b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB;
1.10 lukem 466: b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB;
1.1 jdolecek 467:
468: if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) {
469: if (bsp->bs50.bsBootSectSig0 != BOOTSIG0
470: || bsp->bs50.bsBootSectSig1 != BOOTSIG1) {
471: error = EINVAL;
472: goto error_exit;
473: }
474: }
475:
476: pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK);
1.3 dsl 477: memset(pmp, 0, sizeof *pmp);
1.1 jdolecek 478: pmp->pm_mountp = mp;
479:
480: /*
481: * Compute several useful quantities from the bpb in the
482: * bootsector. Copy in the dos 5 variant of the bpb then fix up
483: * the fields that are different between dos 5 and dos 3.3.
484: */
485: SecPerClust = b50->bpbSecPerClust;
486: pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec);
487: pmp->pm_ResSectors = getushort(b50->bpbResSectors);
488: pmp->pm_FATs = b50->bpbFATs;
489: pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts);
490: pmp->pm_Sectors = getushort(b50->bpbSectors);
491: pmp->pm_FATsecs = getushort(b50->bpbFATsecs);
492: pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack);
493: pmp->pm_Heads = getushort(b50->bpbHeads);
494: pmp->pm_Media = b50->bpbMedia;
495:
496: if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) {
497: /* XXX - We should probably check more values here */
498: if (!pmp->pm_BytesPerSec || !SecPerClust
499: || pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) {
500: error = EINVAL;
501: goto error_exit;
502: }
503: }
504:
505: if (pmp->pm_Sectors == 0) {
506: pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs);
507: pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors);
508: } else {
509: pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs);
510: pmp->pm_HugeSectors = pmp->pm_Sectors;
511: }
512: dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
513: if (pmp->pm_HugeSectors > 0xffffffff / dirsperblk + 1) {
514: /*
515: * We cannot deal currently with this size of disk
516: * due to fileid limitations (see msdosfs_getattr and
517: * msdosfs_readdir)
518: */
519: error = EINVAL;
520: goto error_exit;
521: }
522:
523: if (pmp->pm_RootDirEnts == 0) {
524: if (bsp->bs710.bsBootSectSig2 != BOOTSIG2
525: || bsp->bs710.bsBootSectSig3 != BOOTSIG3
526: || pmp->pm_Sectors
527: || pmp->pm_FATsecs
528: || getushort(b710->bpbFSVers)) {
529: error = EINVAL;
530: goto error_exit;
531: }
532: pmp->pm_fatmask = FAT32_MASK;
533: pmp->pm_fatmult = 4;
534: pmp->pm_fatdiv = 1;
535: pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs);
536:
537: /* mirrorring is enabled if the FATMIRROR bit is not set */
538: if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0)
539: pmp->pm_flags |= MSDOSFS_FATMIRROR;
540: else
541: pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM;
542: } else
543: pmp->pm_flags |= MSDOSFS_FATMIRROR;
544:
545: if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
546: if (FAT32(pmp)) {
547: /*
548: * GEMDOS doesn't know fat32.
549: */
550: error = EINVAL;
551: goto error_exit;
552: }
553:
554: /*
555: * Check a few values (could do some more):
556: * - logical sector size: power of 2, >= block size
557: * - sectors per cluster: power of 2, >= 1
558: * - number of sectors: >= 1, <= size of partition
559: */
560: if ( (SecPerClust == 0)
561: || (SecPerClust & (SecPerClust - 1))
562: || (pmp->pm_BytesPerSec < bsize)
563: || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1))
564: || (pmp->pm_HugeSectors == 0)
565: || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize)
566: > dpart.part->p_size)
567: ) {
568: error = EINVAL;
569: goto error_exit;
570: }
571: /*
572: * XXX - Many parts of the msdos fs driver seem to assume that
573: * the number of bytes per logical sector (BytesPerSec) will
574: * always be the same as the number of bytes per disk block
575: * Let's pretend it is.
576: */
577: tmp = pmp->pm_BytesPerSec / bsize;
578: pmp->pm_BytesPerSec = bsize;
579: pmp->pm_HugeSectors *= tmp;
580: pmp->pm_HiddenSects *= tmp;
581: pmp->pm_ResSectors *= tmp;
582: pmp->pm_Sectors *= tmp;
583: pmp->pm_FATsecs *= tmp;
584: SecPerClust *= tmp;
585: }
586: pmp->pm_fatblk = pmp->pm_ResSectors;
587: if (FAT32(pmp)) {
588: pmp->pm_rootdirblk = getulong(b710->bpbRootClust);
589: pmp->pm_firstcluster = pmp->pm_fatblk
590: + (pmp->pm_FATs * pmp->pm_FATsecs);
591: pmp->pm_fsinfo = getushort(b710->bpbFSInfo);
592: } else {
593: pmp->pm_rootdirblk = pmp->pm_fatblk +
594: (pmp->pm_FATs * pmp->pm_FATsecs);
595: pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry)
596: + pmp->pm_BytesPerSec - 1)
597: / pmp->pm_BytesPerSec;/* in sectors */
598: pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize;
599: }
600:
601: pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) /
602: SecPerClust;
603: pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1;
604: pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec;
605:
606: if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
607: if (pmp->pm_nmbrofclusters <= (0xff0 - 2)
608: && (dtype == DTYPE_FLOPPY
609: || (dtype == DTYPE_VND
610: && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2)))
611: ) {
612: pmp->pm_fatmask = FAT12_MASK;
613: pmp->pm_fatmult = 3;
614: pmp->pm_fatdiv = 2;
615: } else {
616: pmp->pm_fatmask = FAT16_MASK;
617: pmp->pm_fatmult = 2;
618: pmp->pm_fatdiv = 1;
619: }
620: } else if (pmp->pm_fatmask == 0) {
621: if (pmp->pm_maxcluster
622: <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) {
623: /*
624: * This will usually be a floppy disk. This size makes
625: * sure that one fat entry will not be split across
626: * multiple blocks.
627: */
628: pmp->pm_fatmask = FAT12_MASK;
629: pmp->pm_fatmult = 3;
630: pmp->pm_fatdiv = 2;
631: } else {
632: pmp->pm_fatmask = FAT16_MASK;
633: pmp->pm_fatmult = 2;
634: pmp->pm_fatdiv = 1;
635: }
636: }
637: if (FAT12(pmp))
638: pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec;
639: else
640: pmp->pm_fatblocksize = MAXBSIZE;
641:
642: pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec;
643: pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1;
644:
645: /*
646: * Compute mask and shift value for isolating cluster relative byte
647: * offsets and cluster numbers from a file offset.
648: */
649: pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec;
650: pmp->pm_crbomask = pmp->pm_bpcluster - 1;
651: pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1;
652:
653: /*
654: * Check for valid cluster size
655: * must be a power of 2
656: */
657: if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) {
658: error = EINVAL;
659: goto error_exit;
660: }
661:
662: /*
663: * Release the bootsector buffer.
664: */
665: brelse(bp);
666: bp = NULL;
667:
668: /*
669: * Check FSInfo.
670: */
671: if (pmp->pm_fsinfo) {
672: struct fsinfo *fp;
673:
674: if ((error = bread(devvp, pmp->pm_fsinfo, 1024, NOCRED, &bp)) != 0)
675: goto error_exit;
676: fp = (struct fsinfo *)bp->b_data;
677: if (!memcmp(fp->fsisig1, "RRaA", 4)
678: && !memcmp(fp->fsisig2, "rrAa", 4)
679: && !memcmp(fp->fsisig3, "\0\0\125\252", 4)
680: && !memcmp(fp->fsisig4, "\0\0\125\252", 4))
681: pmp->pm_nxtfree = getulong(fp->fsinxtfree);
682: else
683: pmp->pm_fsinfo = 0;
684: brelse(bp);
685: bp = NULL;
686: }
687:
688: /*
689: * Check and validate (or perhaps invalidate?) the fsinfo structure?
690: * XXX
691: */
692: if (pmp->pm_fsinfo) {
693: if (pmp->pm_nxtfree == (u_long)-1)
694: pmp->pm_fsinfo = 0;
695: }
696:
697: /*
698: * Allocate memory for the bitmap of allocated clusters, and then
699: * fill it in.
700: */
701: pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1)
702: / N_INUSEBITS)
703: * sizeof(*pmp->pm_inusemap),
704: M_MSDOSFSFAT, M_WAITOK);
705:
706: /*
707: * fillinusemap() needs pm_devvp.
708: */
709: pmp->pm_dev = dev;
710: pmp->pm_devvp = devvp;
711:
712: /*
713: * Have the inuse map filled in.
714: */
715: if ((error = fillinusemap(pmp)) != 0)
716: goto error_exit;
717:
718: /*
719: * If they want fat updates to be synchronous then let them suffer
720: * the performance degradation in exchange for the on disk copy of
721: * the fat being correct just about all the time. I suppose this
722: * would be a good thing to turn on if the kernel is still flakey.
723: */
724: if (mp->mnt_flag & MNT_SYNCHRONOUS)
725: pmp->pm_flags |= MSDOSFSMNT_WAITONFAT;
726:
727: /*
728: * Finish up.
729: */
730: if (ronly)
731: pmp->pm_flags |= MSDOSFSMNT_RONLY;
732: else
733: pmp->pm_fmod = 1;
734: mp->mnt_data = pmp;
735: mp->mnt_stat.f_fsid.val[0] = (long)dev;
736: mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_MSDOS);
737: mp->mnt_flag |= MNT_LOCAL;
738: mp->mnt_dev_bshift = pmp->pm_bnshift;
739: mp->mnt_fs_bshift = pmp->pm_cnshift;
740:
741: #ifdef QUOTA
742: /*
743: * If we ever do quotas for DOS filesystems this would be a place
744: * to fill in the info in the msdosfsmount structure. You dolt,
745: * quotas on dos filesystems make no sense because files have no
746: * owners on dos filesystems. of course there is some empty space
747: * in the directory entry where we could put uid's and gid's.
748: */
749: #endif
750: devvp->v_specmountpoint = mp;
751:
752: return (0);
753:
754: error_exit:;
755: if (bp)
756: brelse(bp);
757: vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1.7 fvdl 758: (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
1.1 jdolecek 759: VOP_UNLOCK(devvp, 0);
760: if (pmp) {
761: if (pmp->pm_inusemap)
762: free(pmp->pm_inusemap, M_MSDOSFSFAT);
763: free(pmp, M_MSDOSFSMNT);
764: mp->mnt_data = NULL;
765: }
766: return (error);
767: }
768:
769: int
1.7 fvdl 770: msdosfs_start(mp, flags, p)
1.1 jdolecek 771: struct mount *mp;
772: int flags;
1.7 fvdl 773: struct proc *p;
1.1 jdolecek 774: {
775:
776: return (0);
777: }
778:
779: /*
780: * Unmount the filesystem described by mp.
781: */
782: int
1.7 fvdl 783: msdosfs_unmount(mp, mntflags, p)
1.1 jdolecek 784: struct mount *mp;
785: int mntflags;
1.7 fvdl 786: struct proc *p;
1.1 jdolecek 787: {
788: struct msdosfsmount *pmp;
789: int error, flags;
790:
791: flags = 0;
792: if (mntflags & MNT_FORCE)
793: flags |= FORCECLOSE;
794: #ifdef QUOTA
795: #endif
796: if ((error = vflush(mp, NULLVP, flags)) != 0)
797: return (error);
798: pmp = VFSTOMSDOSFS(mp);
799: if (pmp->pm_devvp->v_type != VBAD)
800: pmp->pm_devvp->v_specmountpoint = NULL;
801: #ifdef MSDOSFS_DEBUG
802: {
803: struct vnode *vp = pmp->pm_devvp;
804:
805: printf("msdosfs_umount(): just before calling VOP_CLOSE()\n");
806: printf("flag %08x, usecount %d, writecount %ld, holdcnt %ld\n",
807: vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt);
808: printf("id %lu, mount %p, op %p\n",
809: vp->v_id, vp->v_mount, vp->v_op);
810: printf("freef %p, freeb %p, mount %p\n",
811: vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev,
812: vp->v_mount);
813: printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n",
814: vp->v_cleanblkhd.lh_first,
815: vp->v_dirtyblkhd.lh_first,
816: vp->v_numoutput, vp->v_type);
817: printf("union %p, tag %d, data[0] %08x, data[1] %08x\n",
818: vp->v_socket, vp->v_tag,
819: ((u_int *)vp->v_data)[0],
820: ((u_int *)vp->v_data)[1]);
821: }
822: #endif
823: vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY);
824: error = VOP_CLOSE(pmp->pm_devvp,
1.7 fvdl 825: pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, p);
1.1 jdolecek 826: vput(pmp->pm_devvp);
827: free(pmp->pm_inusemap, M_MSDOSFSFAT);
828: free(pmp, M_MSDOSFSMNT);
829: mp->mnt_data = NULL;
830: mp->mnt_flag &= ~MNT_LOCAL;
831: return (error);
832: }
833:
834: int
1.6 thorpej 835: msdosfs_root(mp, vpp)
1.1 jdolecek 836: struct mount *mp;
837: struct vnode **vpp;
838: {
839: struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
840: struct denode *ndep;
841: int error;
842:
843: #ifdef MSDOSFS_DEBUG
844: printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp);
845: #endif
846: if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0)
847: return (error);
848: *vpp = DETOV(ndep);
849: return (0);
850: }
851:
852: int
1.7 fvdl 853: msdosfs_quotactl(mp, cmds, uid, arg, p)
1.1 jdolecek 854: struct mount *mp;
855: int cmds;
856: uid_t uid;
857: caddr_t arg;
1.7 fvdl 858: struct proc *p;
1.1 jdolecek 859: {
860:
861: #ifdef QUOTA
862: return (EOPNOTSUPP);
863: #else
864: return (EOPNOTSUPP);
865: #endif
866: }
867:
868: int
1.7 fvdl 869: msdosfs_statfs(mp, sbp, p)
1.1 jdolecek 870: struct mount *mp;
871: struct statfs *sbp;
1.7 fvdl 872: struct proc *p;
1.1 jdolecek 873: {
874: struct msdosfsmount *pmp;
875:
876: pmp = VFSTOMSDOSFS(mp);
877: #ifdef COMPAT_09
878: sbp->f_type = 4;
879: #else
880: sbp->f_type = 0;
881: #endif
882: sbp->f_bsize = pmp->pm_bpcluster;
883: sbp->f_iosize = pmp->pm_bpcluster;
884: sbp->f_blocks = pmp->pm_nmbrofclusters;
885: sbp->f_bfree = pmp->pm_freeclustercount;
886: sbp->f_bavail = pmp->pm_freeclustercount;
887: sbp->f_files = pmp->pm_RootDirEnts; /* XXX */
888: sbp->f_ffree = 0; /* what to put in here? */
1.4 christos 889: copy_statfs_info(sbp, mp);
1.1 jdolecek 890: return (0);
891: }
892:
893: int
1.7 fvdl 894: msdosfs_sync(mp, waitfor, cred, p)
1.1 jdolecek 895: struct mount *mp;
896: int waitfor;
897: struct ucred *cred;
1.7 fvdl 898: struct proc *p;
1.1 jdolecek 899: {
900: struct vnode *vp, *nvp;
901: struct denode *dep;
902: struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
903: int error, allerror = 0;
904:
905: /*
906: * If we ever switch to not updating all of the fats all the time,
907: * this would be the place to update them from the first one.
908: */
909: if (pmp->pm_fmod != 0) {
910: if (pmp->pm_flags & MSDOSFSMNT_RONLY)
911: panic("msdosfs_sync: rofs mod");
912: else {
913: /* update fats here */
914: }
915: }
916: /*
917: * Write back each (modified) denode.
918: */
919: simple_lock(&mntvnode_slock);
920: loop:
921: for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) {
922: /*
923: * If the vnode that we are about to sync is no longer
924: * assoicated with this mount point, start over.
925: */
926: if (vp->v_mount != mp)
927: goto loop;
928: simple_lock(&vp->v_interlock);
929: nvp = vp->v_mntvnodes.le_next;
930: dep = VTODE(vp);
931: if (waitfor == MNT_LAZY || vp->v_type == VNON ||
932: (((dep->de_flag &
933: (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) &&
934: (LIST_EMPTY(&vp->v_dirtyblkhd) &&
935: vp->v_uobj.uo_npages == 0))) {
936: simple_unlock(&vp->v_interlock);
937: continue;
938: }
939: simple_unlock(&mntvnode_slock);
1.6 thorpej 940: error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK);
1.1 jdolecek 941: if (error) {
942: simple_lock(&mntvnode_slock);
943: if (error == ENOENT)
944: goto loop;
945: continue;
946: }
947: if ((error = VOP_FSYNC(vp, cred,
1.7 fvdl 948: waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0)
1.1 jdolecek 949: allerror = error;
950: vput(vp);
951: simple_lock(&mntvnode_slock);
952: }
953: simple_unlock(&mntvnode_slock);
954: /*
955: * Force stale file system control information to be flushed.
956: */
957: if ((error = VOP_FSYNC(pmp->pm_devvp, cred,
1.7 fvdl 958: waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0)
1.1 jdolecek 959: allerror = error;
960: #ifdef QUOTA
961: /* qsync(mp); */
962: #endif
963: return (allerror);
964: }
965:
966: int
1.6 thorpej 967: msdosfs_fhtovp(mp, fhp, vpp)
1.1 jdolecek 968: struct mount *mp;
969: struct fid *fhp;
970: struct vnode **vpp;
971: {
972: struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
973: struct defid *defhp = (struct defid *) fhp;
974: struct denode *dep;
975: int error;
976:
977: error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep);
978: if (error) {
979: *vpp = NULLVP;
980: return (error);
981: }
982: *vpp = DETOV(dep);
983: return (0);
984: }
985:
986: int
987: msdosfs_checkexp(mp, nam, exflagsp, credanonp)
988: struct mount *mp;
989: struct mbuf *nam;
990: int *exflagsp;
991: struct ucred **credanonp;
992: {
993: struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
994: struct netcred *np;
995:
996: np = vfs_export_lookup(mp, &pmp->pm_export, nam);
997: if (np == NULL)
998: return (EACCES);
999: *exflagsp = np->netc_exflags;
1000: *credanonp = &np->netc_anon;
1001: return (0);
1002: }
1003:
1004: int
1005: msdosfs_vptofh(vp, fhp)
1006: struct vnode *vp;
1007: struct fid *fhp;
1008: {
1009: struct denode *dep;
1010: struct defid *defhp;
1011:
1012: dep = VTODE(vp);
1013: defhp = (struct defid *)fhp;
1014: defhp->defid_len = sizeof(struct defid);
1015: defhp->defid_dirclust = dep->de_dirclust;
1016: defhp->defid_dirofs = dep->de_diroffset;
1017: /* defhp->defid_gen = dep->de_gen; */
1018: return (0);
1019: }
1020:
1021: int
1.6 thorpej 1022: msdosfs_vget(mp, ino, vpp)
1.1 jdolecek 1023: struct mount *mp;
1024: ino_t ino;
1025: struct vnode **vpp;
1026: {
1027:
1028: return (EOPNOTSUPP);
1029: }
1030:
1.12 atatat 1031: SYSCTL_SETUP(sysctl_vfs_msdosfs_setup, "sysctl vfs.msdosfs subtree setup")
1.1 jdolecek 1032: {
1.12 atatat 1033:
1.13 atatat 1034: sysctl_createv(clog, 0, NULL, NULL,
1035: CTLFLAG_PERMANENT,
1.12 atatat 1036: CTLTYPE_NODE, "vfs", NULL,
1037: NULL, 0, NULL, 0,
1038: CTL_VFS, CTL_EOL);
1.13 atatat 1039: sysctl_createv(clog, 0, NULL, NULL,
1040: CTLFLAG_PERMANENT,
1.13.2.1 tron 1041: CTLTYPE_NODE, "msdosfs",
1042: SYSCTL_DESCR("MS-DOS file system"),
1.12 atatat 1043: NULL, 0, NULL, 0,
1044: CTL_VFS, 4, CTL_EOL);
1045: /*
1046: * XXX the "4" above could be dynamic, thereby eliminating one
1047: * more instance of the "number to vfs" mapping problem, but
1048: * "4" is the order as taken from sys/mount.h
1049: */
1.1 jdolecek 1050: }
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