Annotation of src/sys/fs/msdosfs/msdosfsmount.h, Revision 1.5
1.5 ! yamt 1: /* $NetBSD: msdosfsmount.h,v 1.4 2003/09/07 22:09:11 itojun 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: /*
51: * Arguments to mount MSDOS filesystems.
52: */
53: struct msdosfs_args {
54: char *fspec; /* blocks special holding the fs to mount */
55: struct export_args export; /* network export information */
56: uid_t uid; /* uid that owns msdosfs files */
57: gid_t gid; /* gid that owns msdosfs files */
58: mode_t mask; /* mask to be applied for msdosfs perms */
1.4 itojun 59: int gmtoff; /* offset from UTC in seconds */
1.1 jdolecek 60: int flags; /* see below */
1.3 jdolecek 61:
62: /* Following items added after versioning support */
63: int version; /* version of the struct */
64: #define MSDOSFSMNT_VERSION 2
65: mode_t dirmask; /* v2: mask to be applied for msdosfs perms */
1.1 jdolecek 66: };
67:
68: /*
69: * Msdosfs mount options:
70: */
71: #define MSDOSFSMNT_SHORTNAME 1 /* Force old DOS short names only */
72: #define MSDOSFSMNT_LONGNAME 2 /* Force Win'95 long names */
73: #define MSDOSFSMNT_NOWIN95 4 /* Completely ignore Win95 entries */
74: #define MSDOSFSMNT_GEMDOSFS 8 /* This is a gemdos-flavour */
1.3 jdolecek 75: #define MSDOSFSMNT_VERSIONED 16 /* Struct is versioned */
1.1 jdolecek 76:
77: /* All flags above: */
78: #define MSDOSFSMNT_MNTOPT \
79: (MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \
1.3 jdolecek 80: |MSDOSFSMNT_GEMDOSFS|MSDOSFSMNT_VERSIONED)
81:
1.1 jdolecek 82: #define MSDOSFSMNT_RONLY 0x80000000 /* mounted read-only */
83: #define MSDOSFSMNT_WAITONFAT 0x40000000 /* mounted synchronous */
84: #define MSDOSFS_FATMIRROR 0x20000000 /* FAT is mirrored */
85:
86: #define MSDOSFSMNT_BITS "\177\20" \
1.3 jdolecek 87: "b\00shortname\0b\01longname\0b\02nowin95\0b\03gemdosfs\0b\04mntversioned\0" \
1.5 ! yamt 88: "b\037ronly\0b\036waitonfat\0b\035fatmirror\0"
1.1 jdolecek 89:
90: #ifdef _KERNEL
1.2 thorpej 91: #include <sys/mallocvar.h>
92: MALLOC_DECLARE(M_MSDOSFSMNT);
93:
1.1 jdolecek 94: /*
95: * Layout of the mount control block for a msdos file system.
96: */
97: struct msdosfsmount {
98: struct mount *pm_mountp;/* vfs mount struct for this fs */
99: dev_t pm_dev; /* block special device mounted */
100: uid_t pm_uid; /* uid to set as owner of the files */
101: gid_t pm_gid; /* gid to set as owner of the files */
1.3 jdolecek 102: mode_t pm_mask; /* mask to and with file protection bits
103: for files */
104: mode_t pm_dirmask; /* mask to and with file protection bits
105: for directories */
1.4 itojun 106: int pm_gmtoff; /* offset from UTC in seconds */
1.1 jdolecek 107: struct vnode *pm_devvp; /* vnode for block device mntd */
108: struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */
109: u_long pm_FATsecs; /* actual number of fat sectors */
110: u_long pm_fatblk; /* block # of first FAT */
111: u_long pm_rootdirblk; /* block # (cluster # for FAT32) of root directory number */
112: u_long pm_rootdirsize; /* size in blocks (not clusters) */
113: u_long pm_firstcluster; /* block number of first cluster */
114: u_long pm_nmbrofclusters; /* # of clusters in filesystem */
115: u_long pm_maxcluster; /* maximum cluster number */
116: u_long pm_freeclustercount; /* number of free clusters */
117: u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */
118: u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */
119: u_long pm_bnshift; /* shift file offset right this amount to get a block number */
120: u_long pm_bpcluster; /* bytes per cluster */
121: u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */
122: u_long pm_fatblocksize; /* size of fat blocks in bytes */
123: u_long pm_fatblocksec; /* size of fat blocks in sectors */
124: u_long pm_fatsize; /* size of fat in bytes */
125: u_long pm_fatmask; /* mask to use for fat numbers */
126: u_long pm_fsinfo; /* fsinfo block number */
127: u_long pm_nxtfree; /* next free cluster in fsinfo block */
128: u_int pm_fatmult; /* these 2 values are used in fat */
129: u_int pm_fatdiv; /* offset computation */
130: u_int pm_curfat; /* current fat for FAT32 (0 otherwise) */
131: u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */
132: u_int pm_flags; /* see below */
133: struct netexport pm_export; /* export information */
134: };
135: /* Byte offset in FAT on filesystem pmp, cluster cn */
136: #define FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv)
137:
138: #define VFSTOMSDOSFS(mp) ((struct msdosfsmount *)mp->mnt_data)
139:
140: /* Number of bits in one pm_inusemap item: */
141: #define N_INUSEBITS (8 * sizeof(u_int))
142:
143: /*
144: * Shorthand for fields in the bpb contained in the msdosfsmount structure.
145: */
146: #define pm_BytesPerSec pm_bpb.bpbBytesPerSec
147: #define pm_ResSectors pm_bpb.bpbResSectors
148: #define pm_FATs pm_bpb.bpbFATs
149: #define pm_RootDirEnts pm_bpb.bpbRootDirEnts
150: #define pm_Sectors pm_bpb.bpbSectors
151: #define pm_Media pm_bpb.bpbMedia
152: #define pm_SecPerTrack pm_bpb.bpbSecPerTrack
153: #define pm_Heads pm_bpb.bpbHeads
154: #define pm_HiddenSects pm_bpb.bpbHiddenSecs
155: #define pm_HugeSectors pm_bpb.bpbHugeSectors
156:
157: /*
158: * Convert pointer to buffer -> pointer to direntry
159: */
160: #define bptoep(pmp, bp, dirofs) \
161: ((struct direntry *)(((bp)->b_data) \
162: + ((dirofs) & (pmp)->pm_crbomask)))
163:
164: /*
165: * Convert block number to cluster number
166: */
167: #define de_bn2cn(pmp, bn) \
168: ((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
169:
170: /*
171: * Convert cluster number to block number
172: */
173: #define de_cn2bn(pmp, cn) \
174: ((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
175:
176: /*
177: * Convert file offset to cluster number
178: */
179: #define de_cluster(pmp, off) \
180: ((off) >> (pmp)->pm_cnshift)
181:
182: /*
183: * Clusters required to hold size bytes
184: */
185: #define de_clcount(pmp, size) \
186: (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift)
187:
188: /*
189: * Convert file offset to block number
190: */
191: #define de_blk(pmp, off) \
192: (de_cn2bn(pmp, de_cluster((pmp), (off))))
193:
194: /*
195: * Convert cluster number to file offset
196: */
197: #define de_cn2off(pmp, cn) \
198: ((cn) << (pmp)->pm_cnshift)
199:
200: /*
201: * Convert block number to file offset
202: */
203: #define de_bn2off(pmp, bn) \
204: ((bn) << (pmp)->pm_bnshift)
205: /*
206: * Map a cluster number into a filesystem relative block number.
207: */
208: #define cntobn(pmp, cn) \
209: (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster)
210:
211: /*
212: * Calculate block number for directory entry in root dir, offset dirofs
213: */
214: #define roottobn(pmp, dirofs) \
215: (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk)
216:
217: /*
218: * Calculate block number for directory entry at cluster dirclu, offset
219: * dirofs
220: */
221: #define detobn(pmp, dirclu, dirofs) \
222: ((dirclu) == MSDOSFSROOT \
223: ? roottobn((pmp), (dirofs)) \
224: : cntobn((pmp), (dirclu)))
225:
226: /*
227: * Prototypes for MSDOSFS virtual filesystem operations
228: */
229: void msdosfs_init __P((void));
230: void msdosfs_reinit __P((void));
231: void msdosfs_done __P((void));
232:
233: #endif /* _KERNEL */
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