Annotation of src/sys/fs/msdosfs/msdosfsmount.h, Revision 1.3
1.3 ! jdolecek 1: /* $NetBSD: msdosfsmount.h,v 1.2 2003/02/01 06:23:41 thorpej 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 */
59: int flags; /* see below */
1.3 ! jdolecek 60:
! 61: /* Following items added after versioning support */
! 62: int version; /* version of the struct */
! 63: #define MSDOSFSMNT_VERSION 2
! 64: mode_t dirmask; /* v2: mask to be applied for msdosfs perms */
1.1 jdolecek 65: };
66:
67: /*
68: * Msdosfs mount options:
69: */
70: #define MSDOSFSMNT_SHORTNAME 1 /* Force old DOS short names only */
71: #define MSDOSFSMNT_LONGNAME 2 /* Force Win'95 long names */
72: #define MSDOSFSMNT_NOWIN95 4 /* Completely ignore Win95 entries */
73: #define MSDOSFSMNT_GEMDOSFS 8 /* This is a gemdos-flavour */
1.3 ! jdolecek 74: #define MSDOSFSMNT_VERSIONED 16 /* Struct is versioned */
1.1 jdolecek 75:
76: /* All flags above: */
77: #define MSDOSFSMNT_MNTOPT \
78: (MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \
1.3 ! jdolecek 79: |MSDOSFSMNT_GEMDOSFS|MSDOSFSMNT_VERSIONED)
! 80:
1.1 jdolecek 81: #define MSDOSFSMNT_RONLY 0x80000000 /* mounted read-only */
82: #define MSDOSFSMNT_WAITONFAT 0x40000000 /* mounted synchronous */
83: #define MSDOSFS_FATMIRROR 0x20000000 /* FAT is mirrored */
84:
85: #define MSDOSFSMNT_BITS "\177\20" \
1.3 ! jdolecek 86: "b\00shortname\0b\01longname\0b\02nowin95\0b\03gemdosfs\0b\04mntversioned\0" \
1.1 jdolecek 87: "b\037ronly\0b\036waitonfat\0b\035fatmirror"
88:
89: #ifdef _KERNEL
1.2 thorpej 90: #include <sys/mallocvar.h>
91: MALLOC_DECLARE(M_MSDOSFSMNT);
92:
1.1 jdolecek 93: /*
94: * Layout of the mount control block for a msdos file system.
95: */
96: struct msdosfsmount {
97: struct mount *pm_mountp;/* vfs mount struct for this fs */
98: dev_t pm_dev; /* block special device mounted */
99: uid_t pm_uid; /* uid to set as owner of the files */
100: gid_t pm_gid; /* gid to set as owner of the files */
1.3 ! jdolecek 101: mode_t pm_mask; /* mask to and with file protection bits
! 102: for files */
! 103: mode_t pm_dirmask; /* mask to and with file protection bits
! 104: for directories */
1.1 jdolecek 105: struct vnode *pm_devvp; /* vnode for block device mntd */
106: struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */
107: u_long pm_FATsecs; /* actual number of fat sectors */
108: u_long pm_fatblk; /* block # of first FAT */
109: u_long pm_rootdirblk; /* block # (cluster # for FAT32) of root directory number */
110: u_long pm_rootdirsize; /* size in blocks (not clusters) */
111: u_long pm_firstcluster; /* block number of first cluster */
112: u_long pm_nmbrofclusters; /* # of clusters in filesystem */
113: u_long pm_maxcluster; /* maximum cluster number */
114: u_long pm_freeclustercount; /* number of free clusters */
115: u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */
116: u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */
117: u_long pm_bnshift; /* shift file offset right this amount to get a block number */
118: u_long pm_bpcluster; /* bytes per cluster */
119: u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */
120: u_long pm_fatblocksize; /* size of fat blocks in bytes */
121: u_long pm_fatblocksec; /* size of fat blocks in sectors */
122: u_long pm_fatsize; /* size of fat in bytes */
123: u_long pm_fatmask; /* mask to use for fat numbers */
124: u_long pm_fsinfo; /* fsinfo block number */
125: u_long pm_nxtfree; /* next free cluster in fsinfo block */
126: u_int pm_fatmult; /* these 2 values are used in fat */
127: u_int pm_fatdiv; /* offset computation */
128: u_int pm_curfat; /* current fat for FAT32 (0 otherwise) */
129: u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */
130: u_int pm_flags; /* see below */
131: struct netexport pm_export; /* export information */
132: };
133: /* Byte offset in FAT on filesystem pmp, cluster cn */
134: #define FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv)
135:
136: #define VFSTOMSDOSFS(mp) ((struct msdosfsmount *)mp->mnt_data)
137:
138: /* Number of bits in one pm_inusemap item: */
139: #define N_INUSEBITS (8 * sizeof(u_int))
140:
141: /*
142: * Shorthand for fields in the bpb contained in the msdosfsmount structure.
143: */
144: #define pm_BytesPerSec pm_bpb.bpbBytesPerSec
145: #define pm_ResSectors pm_bpb.bpbResSectors
146: #define pm_FATs pm_bpb.bpbFATs
147: #define pm_RootDirEnts pm_bpb.bpbRootDirEnts
148: #define pm_Sectors pm_bpb.bpbSectors
149: #define pm_Media pm_bpb.bpbMedia
150: #define pm_SecPerTrack pm_bpb.bpbSecPerTrack
151: #define pm_Heads pm_bpb.bpbHeads
152: #define pm_HiddenSects pm_bpb.bpbHiddenSecs
153: #define pm_HugeSectors pm_bpb.bpbHugeSectors
154:
155: /*
156: * Convert pointer to buffer -> pointer to direntry
157: */
158: #define bptoep(pmp, bp, dirofs) \
159: ((struct direntry *)(((bp)->b_data) \
160: + ((dirofs) & (pmp)->pm_crbomask)))
161:
162: /*
163: * Convert block number to cluster number
164: */
165: #define de_bn2cn(pmp, bn) \
166: ((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
167:
168: /*
169: * Convert cluster number to block number
170: */
171: #define de_cn2bn(pmp, cn) \
172: ((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
173:
174: /*
175: * Convert file offset to cluster number
176: */
177: #define de_cluster(pmp, off) \
178: ((off) >> (pmp)->pm_cnshift)
179:
180: /*
181: * Clusters required to hold size bytes
182: */
183: #define de_clcount(pmp, size) \
184: (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift)
185:
186: /*
187: * Convert file offset to block number
188: */
189: #define de_blk(pmp, off) \
190: (de_cn2bn(pmp, de_cluster((pmp), (off))))
191:
192: /*
193: * Convert cluster number to file offset
194: */
195: #define de_cn2off(pmp, cn) \
196: ((cn) << (pmp)->pm_cnshift)
197:
198: /*
199: * Convert block number to file offset
200: */
201: #define de_bn2off(pmp, bn) \
202: ((bn) << (pmp)->pm_bnshift)
203: /*
204: * Map a cluster number into a filesystem relative block number.
205: */
206: #define cntobn(pmp, cn) \
207: (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster)
208:
209: /*
210: * Calculate block number for directory entry in root dir, offset dirofs
211: */
212: #define roottobn(pmp, dirofs) \
213: (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk)
214:
215: /*
216: * Calculate block number for directory entry at cluster dirclu, offset
217: * dirofs
218: */
219: #define detobn(pmp, dirclu, dirofs) \
220: ((dirclu) == MSDOSFSROOT \
221: ? roottobn((pmp), (dirofs)) \
222: : cntobn((pmp), (dirclu)))
223:
224: /*
225: * Prototypes for MSDOSFS virtual filesystem operations
226: */
227: void msdosfs_init __P((void));
228: void msdosfs_reinit __P((void));
229: void msdosfs_done __P((void));
230:
231: #endif /* _KERNEL */
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