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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | /* |
| 2 | * |
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| 3 | * |
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| 4 | * |
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| 5 | */ |
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| 6 | |||
| 7 | #ifndef __MSDOS_H__ |
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| 8 | #define __MSDOS_H__ |
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| 9 | |||
| 10 | #include "dentry.h" |
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| 11 | #include "inode.h" |
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| 12 | #include "super.h" |
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| 13 | |||
| 14 | #include "dentryop.h" |
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| 15 | #include "inodeop.h" |
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| 16 | #include "superop.h" |
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| 17 | |||
| 18 | extern struct dentry_operations msdos_dentry_operations; |
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| 19 | extern struct inode_operations msdos_inode_ro_operations; |
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| 20 | extern struct file_operations msdos_file_ro_operations; |
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| 21 | extern struct super_operations msdos_super_operations; |
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| 22 | |||
| 23 | extern struct inode_operations msdos_inode_rw_operations; |
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| 24 | extern struct file_operations msdos_file_rw_operations; |
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| 25 | |||
| 26 | /* |
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| 27 | * directory entry |
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| 28 | */ |
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| 29 | |||
| 30 | #define ATTR_RDONLY 0x01 |
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| 31 | #define ATTR_HIDDEN 0x02 |
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| 32 | #define ATTR_SYSTEM 0x04 |
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| 33 | #define ATTR_VOLUME 0x08 |
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| 34 | #define ATTR_DIR 0x10 |
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| 35 | #define ATTR_ARCH 0x20 |
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| 36 | |||
| 37 | struct directoryentry { |
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| 38 | __uint8_t name[8]; |
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| 39 | __uint8_t ext[3]; |
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| 40 | __uint8_t attribute; |
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| 41 | __uint8_t reserved[10]; |
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| 42 | __uint16_t time; |
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| 43 | __uint16_t date; |
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| 44 | __uint16_t cluster; |
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| 45 | __uint32_t size; |
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| 46 | } __attribute__ ((packed)); |
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| 47 | |||
| 48 | /* for debugging */ |
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| 49 | extern void msdos_dump_direntry(struct directoryentry *ptr); |
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| 50 | |||
| 51 | /* directory entry types */ |
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| 52 | |||
| 53 | #define LASTENTRYCHAR 0x00 |
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| 54 | #define ERASEDENTRYCHAR 0xe5 |
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| 55 | |||
| 56 | extern __inline__ int msdos_islastentry(struct directoryentry *de) |
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| 57 | { |
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| 58 | return (*((de)->name)==LASTENTRYCHAR); |
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| 59 | } |
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| 60 | |||
| 61 | extern __inline__ int msdos_isfreeentry(struct directoryentry *de) |
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| 62 | { |
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| 63 | return (*((de)->name)==LASTENTRYCHAR|| |
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| 64 | *((de)->name)==ERASEDENTRYCHAR); |
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| 65 | } |
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| 66 | |||
| 67 | extern __inline__ int msdos_isunvalidentry(struct directoryentry *de) |
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| 68 | { |
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| 69 | return (*((de)->name)==ERASEDENTRYCHAR)|| |
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| 70 | ((de)->attribute&ATTR_VOLUME)|| |
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| 71 | (msdos_islastentry(de)); |
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| 72 | } |
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| 73 | |||
| 74 | extern __inline__ void msdos_markentrybusy(struct directoryentry *de) |
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| 75 | { |
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| 76 | *((de)->name)='~'; |
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| 77 | } |
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| 78 | |||
| 79 | extern __inline__ void msdos_markentryfree(struct directoryentry *de) |
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| 80 | { |
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| 81 | *((de)->name)=ERASEDENTRYCHAR; |
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| 82 | } |
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| 83 | |||
| 84 | /* */ |
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| 85 | extern int msdos_formatname(struct directoryentry *de, struct qstr *str); |
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| 86 | |||
| 87 | /* |
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| 88 | * constants |
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| 89 | */ |
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| 90 | |||
| 91 | #define CLUSTER_MASK 0xffff0000 |
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| 92 | #define CLUSTER_SHIFT 16 |
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| 93 | #define DENTRY_MASK 0x0000ffff |
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| 94 | #define DENTRY_SHIFT 0 |
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| 95 | |||
| 96 | #define ROOT_CLUSTER 0x0000 |
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| 97 | #define SPECIAL_CLUSTER 0x0001 |
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| 98 | #define FREE_CLUSTER 0xfffe |
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| 99 | #define NO_CLUSTER 0xffff |
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| 100 | |||
| 101 | #define DIRENTRYSIZE 32 |
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| 102 | #define SECTORSIZE 512 |
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| 103 | |||
| 104 | /* first cluster of a msdos volume */ |
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| 105 | #define STARTCLUSTER 2 |
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| 106 | |||
| 107 | /* these on msdos directory structure */ |
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| 108 | #define FREECLUSTER 0x0000 |
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| 109 | #define LASTCLUSTER 0xffff |
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| 110 | #define BADCLUSTER 0xfff7 |
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| 111 | |||
| 112 | /* max numbers of fats for volume (that must be supported) */ |
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| 113 | #define MAXFATS 4 |
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| 114 | /* |
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| 115 | * 0x01230008 e' la 8' entry del 123 cluster |
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| 116 | * 0x00000000 e' la root dir (non ha entry) |
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| 117 | * 0x00010005 e' la 5' entry nella root |
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| 118 | */ |
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| 119 | |||
| 120 | #define CLUOFF2INODE(cluster,deoffs) ((((__uint32_t)cluster)<<CLUSTER_SHIFT)|\ |
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| 121 | ((deoffs)&DENTRY_MASK)\ |
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| 122 | ) |
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| 123 | #define INODE2CLUSTER(inode) ((__uint16_t)((inode)>>CLUSTER_SHIFT)) |
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| 124 | #define INODE2DEOFFS(inode) ((__uint16_t)((inode)&DENTRY_MASK)) |
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| 125 | |||
| 126 | #define ROOT_INODE CLUOFF2INODE(ROOT_CLUSTER,0) |
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| 127 | |||
| 128 | /* |
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| 129 | * |
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| 130 | */ |
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| 131 | |||
| 132 | /* what is the logical sector of a cluster */ |
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| 133 | extern __inline__ __uint32_t msdos_cluster2sector(struct inode *in, |
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| 134 | __uint16_t cluster) |
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| 135 | { |
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| 136 | if (cluster==NO_CLUSTER|| |
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| 137 | cluster==SPECIAL_CLUSTER|| |
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| 138 | cluster==FREE_CLUSTER) return (__uint32_t)(-1); |
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| 139 | if (cluster==ROOT_CLUSTER) return MSDOS_SB(in->i_sb).lroot; |
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| 140 | return (cluster-2)*MSDOS_SB(in->i_sb).spc+MSDOS_SB(in->i_sb).ldata; |
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| 141 | } |
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| 142 | |||
| 143 | /* |
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| 144 | #define msdos_cluster2sector(in,cl) \ |
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| 145 | ( \ |
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| 146 | ((cl)==NO_CLUSTER||(cl)==SPECIAL_CLUSTER||(cl)==FREE_CLUSTER)? \ |
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| 147 | (-1): \ |
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| 148 | ( \ |
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| 149 | ((cl)==ROOT_CLUSTER?) \ |
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| 150 | MSDOS_SB((in-)>i_sb).lroot: \ |
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| 151 | ((cl)-2)*MSDOS_SB((in)->i_sb).spc+MSDOS_SB((in)->i_sb).ldata \ |
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| 152 | ) \ |
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| 153 | ) |
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| 154 | */ |
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| 155 | |||
| 156 | __uint32_t msdos_cluster2sector(struct inode *in, __uint16_t cluster); |
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| 157 | |||
| 158 | __uint16_t msdos_nextcluster(struct super_block *sb, __uint16_t cluster); |
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| 159 | void msdos_freecluster(struct super_block *sb, __uint16_t cluster); |
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| 160 | void msdos_lastcluster(struct super_block *sb, __uint16_t cluster); |
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| 161 | __uint16_t msdos_addcluster(struct super_block *sb, __uint16_t lacluster); |
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| 162 | void msdos_freeclusterchain(struct super_block *sb, __uint16_t cluster); |
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| 163 | |||
| 164 | #endif |