linux/fs/minix/minix.h
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   1#ifndef FS_MINIX_H
   2#define FS_MINIX_H
   3
   4#include <linux/fs.h>
   5#include <linux/pagemap.h>
   6#include <linux/minix_fs.h>
   7
   8#define INODE_VERSION(inode)    minix_sb(inode->i_sb)->s_version
   9#define MINIX_V1                0x0001          /* original minix fs */
  10#define MINIX_V2                0x0002          /* minix V2 fs */
  11#define MINIX_V3                0x0003          /* minix V3 fs */
  12
  13/*
  14 * minix fs inode data in memory
  15 */
  16struct minix_inode_info {
  17        union {
  18                __u16 i1_data[16];
  19                __u32 i2_data[16];
  20        } u;
  21        struct inode vfs_inode;
  22};
  23
  24/*
  25 * minix super-block data in memory
  26 */
  27struct minix_sb_info {
  28        unsigned long s_ninodes;
  29        unsigned long s_nzones;
  30        unsigned long s_imap_blocks;
  31        unsigned long s_zmap_blocks;
  32        unsigned long s_firstdatazone;
  33        unsigned long s_log_zone_size;
  34        unsigned long s_max_size;
  35        int s_dirsize;
  36        int s_namelen;
  37        struct buffer_head ** s_imap;
  38        struct buffer_head ** s_zmap;
  39        struct buffer_head * s_sbh;
  40        struct minix_super_block * s_ms;
  41        unsigned short s_mount_state;
  42        unsigned short s_version;
  43};
  44
  45extern struct inode *minix_iget(struct super_block *, unsigned long);
  46extern struct minix_inode * minix_V1_raw_inode(struct super_block *, ino_t, struct buffer_head **);
  47extern struct minix2_inode * minix_V2_raw_inode(struct super_block *, ino_t, struct buffer_head **);
  48extern struct inode * minix_new_inode(const struct inode *, umode_t, int *);
  49extern void minix_free_inode(struct inode * inode);
  50extern unsigned long minix_count_free_inodes(struct super_block *sb);
  51extern int minix_new_block(struct inode * inode);
  52extern void minix_free_block(struct inode *inode, unsigned long block);
  53extern unsigned long minix_count_free_blocks(struct super_block *sb);
  54extern int minix_getattr(struct vfsmount *, struct dentry *, struct kstat *);
  55extern int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len);
  56
  57extern void V1_minix_truncate(struct inode *);
  58extern void V2_minix_truncate(struct inode *);
  59extern void minix_truncate(struct inode *);
  60extern void minix_set_inode(struct inode *, dev_t);
  61extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int);
  62extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int);
  63extern unsigned V1_minix_blocks(loff_t, struct super_block *);
  64extern unsigned V2_minix_blocks(loff_t, struct super_block *);
  65
  66extern struct minix_dir_entry *minix_find_entry(struct dentry*, struct page**);
  67extern int minix_add_link(struct dentry*, struct inode*);
  68extern int minix_delete_entry(struct minix_dir_entry*, struct page*);
  69extern int minix_make_empty(struct inode*, struct inode*);
  70extern int minix_empty_dir(struct inode*);
  71extern void minix_set_link(struct minix_dir_entry*, struct page*, struct inode*);
  72extern struct minix_dir_entry *minix_dotdot(struct inode*, struct page**);
  73extern ino_t minix_inode_by_name(struct dentry*);
  74
  75extern const struct inode_operations minix_file_inode_operations;
  76extern const struct inode_operations minix_dir_inode_operations;
  77extern const struct file_operations minix_file_operations;
  78extern const struct file_operations minix_dir_operations;
  79
  80static inline struct minix_sb_info *minix_sb(struct super_block *sb)
  81{
  82        return sb->s_fs_info;
  83}
  84
  85static inline struct minix_inode_info *minix_i(struct inode *inode)
  86{
  87        return list_entry(inode, struct minix_inode_info, vfs_inode);
  88}
  89
  90static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize)
  91{
  92        return DIV_ROUND_UP(bits, blocksize * 8);
  93}
  94
  95#if defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) && \
  96        defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
  97
  98#error Minix file system byte order broken
  99
 100#elif defined(CONFIG_MINIX_FS_NATIVE_ENDIAN)
 101
 102/*
 103 * big-endian 32 or 64 bit indexed bitmaps on big-endian system or
 104 * little-endian bitmaps on little-endian system
 105 */
 106
 107#define minix_test_and_set_bit(nr, addr)        \
 108        __test_and_set_bit((nr), (unsigned long *)(addr))
 109#define minix_set_bit(nr, addr)         \
 110        __set_bit((nr), (unsigned long *)(addr))
 111#define minix_test_and_clear_bit(nr, addr) \
 112        __test_and_clear_bit((nr), (unsigned long *)(addr))
 113#define minix_test_bit(nr, addr)                \
 114        test_bit((nr), (unsigned long *)(addr))
 115#define minix_find_first_zero_bit(addr, size) \
 116        find_first_zero_bit((unsigned long *)(addr), (size))
 117
 118#elif defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
 119
 120/*
 121 * big-endian 16bit indexed bitmaps
 122 */
 123
 124static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)
 125{
 126        const unsigned short *p = vaddr, *addr = vaddr;
 127        unsigned short num;
 128
 129        if (!size)
 130                return 0;
 131
 132        size >>= 4;
 133        while (*p++ == 0xffff) {
 134                if (--size == 0)
 135                        return (p - addr) << 4;
 136        }
 137
 138        num = *--p;
 139        return ((p - addr) << 4) + ffz(num);
 140}
 141
 142#define minix_test_and_set_bit(nr, addr)        \
 143        __test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
 144#define minix_set_bit(nr, addr) \
 145        __set_bit((nr) ^ 16, (unsigned long *)(addr))
 146#define minix_test_and_clear_bit(nr, addr)      \
 147        __test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr))
 148
 149static inline int minix_test_bit(int nr, const void *vaddr)
 150{
 151        const unsigned short *p = vaddr;
 152        return (p[nr >> 4] & (1U << (nr & 15))) != 0;
 153}
 154
 155#else
 156
 157/*
 158 * little-endian bitmaps
 159 */
 160
 161#define minix_test_and_set_bit  __test_and_set_bit_le
 162#define minix_set_bit           __set_bit_le
 163#define minix_test_and_clear_bit        __test_and_clear_bit_le
 164#define minix_test_bit  test_bit_le
 165#define minix_find_first_zero_bit       find_first_zero_bit_le
 166
 167#endif
 168
 169#endif /* FS_MINIX_H */
 170
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