Annotation of sys/msdosfs/msdosfsmount.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: msdosfsmount.h,v 1.18 2006/12/16 12:44:05 krw Exp $ */
2: /* $NetBSD: msdosfsmount.h,v 1.16 1997/10/17 11:24:24 ws 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: /*
52: * Layout of the mount control block for a msdos file system.
53: */
54: struct msdosfsmount {
55: struct mount *pm_mountp;/* vfs mount struct for this fs */
56: dev_t pm_dev; /* block special device mounted */
57: uid_t pm_uid; /* uid to set as owner of the files */
58: gid_t pm_gid; /* gid to set as owner of the files */
59: mode_t pm_mask; /* mask to and with file protection bits */
60: struct vnode *pm_devvp; /* vnode for block device mntd */
61: struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */
62: uint32_t pm_BlkPerSec; /* # of DEV_BSIZE blocks in MSDOSFS sector */
63: uint32_t pm_FATsecs; /* actual number of fat sectors */
64: uint32_t pm_fatblk; /* block # of first FAT */
65: uint32_t pm_rootdirblk; /* block # (cluster # for FAT32) of root directory number */
66: uint32_t pm_rootdirsize; /* size in blocks (not clusters) */
67: uint32_t pm_firstcluster; /* block number of first cluster */
68: uint32_t pm_nmbrofclusters; /* # of clusters in filesystem */
69: uint32_t pm_maxcluster; /* maximum cluster number */
70: uint32_t pm_freeclustercount; /* number of free clusters */
71: uint32_t pm_cnshift; /* shift file offset right this amount to get a cluster number */
72: uint32_t pm_crbomask; /* and a file offset with this mask to get cluster rel offset */
73: uint32_t pm_bnshift; /* shift file offset right this amount to get a block number */
74: uint32_t pm_bpcluster; /* bytes per cluster */
75: uint32_t pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */
76: uint32_t pm_fatblocksize; /* size of fat blocks in bytes */
77: uint32_t pm_fatblocksec; /* size of fat blocks in sectors */
78: uint32_t pm_fatsize; /* size of fat in bytes */
79: uint32_t pm_fatmask; /* mask to use for fat numbers */
80: uint32_t pm_fsinfo; /* fsinfo block number */
81: uint32_t pm_nxtfree; /* next free cluster in fsinfo block */
82: u_int pm_fatmult; /* these 2 values are used in fat */
83: u_int pm_fatdiv; /* offset computation */
84: u_int pm_curfat; /* current fat for FAT32 (0 otherwise) */
85: u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */
86: u_int pm_flags; /* see below */
87: struct netexport pm_export; /* export information */
88: };
89: /* Byte offset in FAT on filesystem pmp, cluster cn */
90: #define FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv)
91:
92: /*
93: * Mount point flags:
94: */
95: #if 0
96: /* Defined in <sys/mount.h> */
97: #define MSDOSFSMNT_SHORTNAME 0x01
98: #define MSDOSFSMNT_LONGNAME 0x02
99: #define MSDOSFSMNT_NOWIN95 0x04
100: #define MSDOSFSMNT_ALLOWDIRX 0x10
101: #endif
102:
103: /* All flags above: */
104: #define MSDOSFSMNT_MNTOPT \
105: (MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \
106: |MSDOSFSMNT_ALLOWDIRX)
107: #define MSDOSFSMNT_RONLY 0x80000000 /* mounted read-only */
108: #define MSDOSFSMNT_WAITONFAT 0x40000000 /* mounted synchronous */
109: #define MSDOSFS_FATMIRROR 0x20000000 /* FAT is mirrored */
110:
111: #define VFSTOMSDOSFS(mp) ((struct msdosfsmount *)mp->mnt_data)
112:
113: /* Number of bits in one pm_inusemap item: */
114: #define N_INUSEBITS (8 * sizeof(u_int))
115:
116: /*
117: * Shorthand for fields in the bpb contained in the msdosfsmount structure.
118: */
119: #define pm_BytesPerSec pm_bpb.bpbBytesPerSec
120: #define pm_ResSectors pm_bpb.bpbResSectors
121: #define pm_FATs pm_bpb.bpbFATs
122: #define pm_RootDirEnts pm_bpb.bpbRootDirEnts
123: #define pm_Sectors pm_bpb.bpbSectors
124: #define pm_Media pm_bpb.bpbMedia
125: #define pm_SecPerTrack pm_bpb.bpbSecPerTrack
126: #define pm_Heads pm_bpb.bpbHeads
127: #define pm_HiddenSects pm_bpb.bpbHiddenSecs
128: #define pm_HugeSectors pm_bpb.bpbHugeSectors
129:
130: /*
131: * Convert pointer to buffer -> pointer to direntry
132: */
133: #define bptoep(pmp, bp, dirofs) \
134: ((struct direntry *)(((bp)->b_data) \
135: + ((dirofs) & (pmp)->pm_crbomask)))
136:
137: /*
138: * Convert block number to cluster number
139: */
140: #define de_bn2cn(pmp, bn) \
141: ((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
142:
143: /*
144: * Convert cluster number to block number
145: */
146: #define de_cn2bn(pmp, cn) \
147: ((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
148:
149: /*
150: * Convert file offset to cluster number
151: */
152: #define de_cluster(pmp, off) \
153: ((off) >> (pmp)->pm_cnshift)
154:
155: /*
156: * Clusters required to hold size bytes
157: */
158: #define de_clcount(pmp, size) \
159: (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift)
160:
161: /*
162: * Convert file offset to block number
163: */
164: #define de_blk(pmp, off) \
165: (de_cn2bn(pmp, de_cluster((pmp), (off))))
166:
167: /*
168: * Convert cluster number to file offset
169: */
170: #define de_cn2off(pmp, cn) \
171: ((cn) << (pmp)->pm_cnshift)
172:
173: /*
174: * Convert block number to file offset
175: */
176: #define de_bn2off(pmp, bn) \
177: ((bn) << (pmp)->pm_bnshift)
178: /*
179: * Map a cluster number into a filesystem relative block number.
180: */
181: #define cntobn(pmp, cn) \
182: (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster)
183:
184: /*
185: * Calculate block number for directory entry in root dir, offset dirofs
186: */
187: #define roottobn(pmp, dirofs) \
188: (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk)
189:
190: /*
191: * Calculate block number for directory entry at cluster dirclu, offset
192: * dirofs
193: */
194: #define detobn(pmp, dirclu, dirofs) \
195: ((dirclu) == MSDOSFSROOT \
196: ? roottobn((pmp), (dirofs)) \
197: : cntobn((pmp), (dirclu)))
198:
199: /* Calculate size of fsinfo block */
200: #define fsi_size(pmp) \
201: (1024 << ((pmp)->pm_BlkPerSec >> 2))
202:
203: /*
204: * Prototypes for MSDOSFS virtual filesystem operations
205: */
206: int msdosfs_mount(struct mount *, const char *, void *, struct nameidata *, struct proc *);
207: int msdosfs_start(struct mount *, int, struct proc *);
208: int msdosfs_unmount(struct mount *, int, struct proc *);
209: int msdosfs_root(struct mount *, struct vnode **);
210: int msdosfs_quotactl(struct mount *, int, uid_t, caddr_t, struct proc *);
211: int msdosfs_statfs(struct mount *, struct statfs *, struct proc *);
212: int msdosfs_sync(struct mount *, int, struct ucred *, struct proc *);
213: int msdosfs_fhtovp(struct mount *, struct fid *, struct vnode **);
214: int msdosfs_vptofh(struct vnode *, struct fid *);
215: int msdosfs_init(struct vfsconf *);
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