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1.1 root 1: /*
2: * Written by Paul Popelka ([email protected])
3: *
4: * You can do anything you want with this software,
5: * just don't say you wrote it,
6: * and don't remove this notice.
7: *
8: * This software is provided "as is".
9: *
10: * The author supplies this software to be publicly
11: * redistributed on the understanding that the author
12: * is not responsible for the correct functioning of
13: * this software in any circumstances and is not liable
14: * for any damages caused by this software.
15: *
16: * October 1992
17: *
18: * pcfsmount.h,v 1.2 1993/05/20 03:34:27 cgd Exp
19: */
20:
21: /*
22: * Layout of the mount control block for a msdos
23: * file system.
24: */
25: struct pcfsmount {
26: struct mount *pm_mountp; /* vfs mount struct for this fs */
27: dev_t pm_dev; /* block special device mounted */
28: struct vnode *pm_devvp; /* vnode for block device mntd */
29: struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */
30: u_long pm_fatblk; /* block # of first FAT */
31: u_long pm_rootdirblk; /* block # of root directory */
32: u_long pm_rootdirsize; /* size in blocks (not clusters) */
33: u_long pm_firstcluster; /* block number of first cluster */
34: u_long pm_nmbrofclusters; /* # of clusters in filesystem */
35: u_long pm_maxcluster; /* maximum cluster number */
36: u_long pm_freeclustercount; /* number of free clusters */
37: u_long pm_lookhere; /* start free cluster search here */
38: u_long pm_bnshift; /* shift file offset right this
39: * amount to get a block number */
40: u_long pm_brbomask; /* and a file offset with this
41: * mask to get block rel offset */
42: u_long pm_cnshift; /* shift file offset right this
43: * amount to get a cluster number */
44: u_long pm_crbomask; /* and a file offset with this
45: * mask to get cluster rel offset */
46: u_long pm_bpcluster; /* bytes per cluster */
47: u_long pm_depclust; /* directory entries per cluster */
48: u_long pm_fmod; /* ~0 if fs is modified, this can
49: * rollover to 0 */
50: u_long pm_fatblocksize; /* size of fat blocks in bytes */
51: u_long pm_fatblocksec; /* size of fat blocks in sectors */
52: u_long pm_fatsize; /* size of fat in bytes */
53: u_char *pm_inusemap; /* ptr to bitmap of in-use clusters */
54: char pm_ronly; /* read only if non-zero */
55: char pm_waitonfat; /* wait for writes of the fat to complt,
56: * when 0 use bdwrite, else use bwrite */
57: };
58: /*
59: * How to compute pm_cnshift and pm_crbomask.
60: *
61: * pm_crbomask = (pm_SectPerClust * pm_BytesPerSect) - 1
62: * if (bytesperclust == 0) return EBADBLKSZ;
63: * bit = 1;
64: * for (i = 0; i < 32; i++) {
65: * if (bit & bytesperclust) {
66: * if (bit ^ bytesperclust) return EBADBLKSZ;
67: * pm_cnshift = i;
68: * break;
69: * }
70: * bit <<= 1;
71: * }
72: */
73:
74: /*
75: * Shorthand for fields in the bpb contained in
76: * the pcfsmount structure.
77: */
78: #define pm_BytesPerSec pm_bpb.bpbBytesPerSec
79: #define pm_SectPerClust pm_bpb.bpbSecPerClust
80: #define pm_ResSectors pm_bpb.bpbResSectors
81: #define pm_FATs pm_bpb.bpbFATs
82: #define pm_RootDirEnts pm_bpb.bpbRootDirEnts
83: #define pm_Sectors pm_bpb.bpbSectors
84: #define pm_Media pm_bpb.bpbMedia
85: #define pm_FATsecs pm_bpb.bpbFATsecs
86: #define pm_SecPerTrack pm_bpb.bpbSecPerTrack
87: #define pm_Heads pm_bpb.bpbHeads
88: #define pm_HiddenSects pm_bpb.bpbHiddenSecs
89: #define pm_HugeSectors pm_bpb.bpbHugeSectors
90:
91: /*
92: * Map a cluster number into a filesystem relative
93: * block number.
94: */
95: #define cntobn(pmp, cn) \
96: ((((cn)-CLUST_FIRST) * (pmp)->pm_SectPerClust) + (pmp)->pm_firstcluster)
97:
98: /*
99: * Map a filesystem relative block number back into
100: * a cluster number.
101: */
102: #define bntocn(pmp, bn) \
103: ((((bn) - pmp->pm_firstcluster)/ (pmp)->pm_SectPerClust) + CLUST_FIRST)
104:
105: /*
106: * Calculate block number for directory entry in root dir, offset dirofs
107: */
108: #define roottobn(pmp, dirofs) \
109: (((dirofs) / (pmp)->pm_depclust) * (pmp)->pm_SectPerClust \
110: + (pmp)->pm_rootdirblk)
111:
112: /*
113: * Calculate block number for directory entry at cluster dirclu, offset dirofs
114: */
115: #define detobn(pmp, dirclu, dirofs) \
116: ((dirclu) == PCFSROOT \
117: ? roottobn((pmp), (dirofs)) \
118: : cntobn((pmp), (dirclu)))
119:
120: /*
121: * Convert pointer to buffer -> pointer to direntry
122: */
123: #define bptoep(pmp, bp, dirofs) \
124: ((struct direntry *)((bp)->b_un.b_addr) \
125: + (dirofs) % (pmp)->pm_depclust)
126:
127:
128: /*
129: * Prototypes for PCFS virtual filesystem operations
130: */
131: int pcfs_mount __P((struct mount *mp, char *path, caddr_t data,
132: struct nameidata *ndp, struct proc *p));
133: int pcfs_start __P((struct mount *mp, int flags, struct proc *p));
134: int pcfs_unmount __P((struct mount *mp, int mntflags, struct proc *p));
135: int pcfs_root __P((struct mount *mp, struct vnode **vpp));
136: int pcfs_quotactl __P((struct mount *mp, int cmds, int uid, /* should be uid_t */
137: caddr_t arg, struct proc *p));
138: int pcfs_statfs __P((struct mount *mp, struct statfs *sbp, struct proc *p));
139: int pcfs_sync __P((struct mount *mp, int waitfor));
140: int pcfs_fhtovp __P((struct mount *mp, struct fid *fhp, struct vnode **vpp));
141: int pcfs_vptofh __P((struct vnode *vp, struct fid *fhp));
142: int pcfs_init __P(());
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