fs/minix/minix.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef FS_MINIX_H
   3 #define FS_MINIX_H
   4
   5 #include <linux/fs.h>
   6 #include <linux/pagemap.h>
   7 #include <linux/minix_fs.h>
   8
   9 #define INODE_VERSION(inode)    minix_sb(inode->i_sb)->s_version
  10 #define MINIX_V1                0x0001          /* original minix fs */
  11 #define MINIX_V2                0x0002          /* minix V2 fs */
  12 #define MINIX_V3                0x0003          /* minix V3 fs */
  13
  14 /*
  15  * minix fs inode data in memory
  16  */
  17 struct minix_inode_info {
  18         union {
  19                 __u16 i1_data[16];
  20                 __u32 i2_data[16];
  21         } u;
  22         struct inode vfs_inode;
  23 };
  24
  25 /*
  26  * minix super-block data in memory
  27  */
  28 struct minix_sb_info {
  29         unsigned long s_ninodes;
  30         unsigned long s_nzones;
  31         unsigned long s_imap_blocks;
  32         unsigned long s_zmap_blocks;
  33         unsigned long s_firstdatazone;
  34         unsigned long s_log_zone_size;
  35         unsigned long s_max_size;
  36         int s_dirsize;
  37         int s_namelen;
  38         struct buffer_head ** s_imap;
  39         struct buffer_head ** s_zmap;
  40         struct buffer_head * s_sbh;
  41         struct minix_super_block * s_ms;
  42         unsigned short s_mount_state;
  43         unsigned short s_version;
  44 };
  45
  46 extern struct inode *minix_iget(struct super_block *, unsigned long);
  47 extern struct minix_inode * minix_V1_raw_inode(struct super_block *, ino_t, struct buffer_head **);
  48 extern struct minix2_inode * minix_V2_raw_inode(struct super_block *, ino_t, struct buffer_head **);
  49 extern struct inode * minix_new_inode(const struct inode *, umode_t, int *);
  50 extern void minix_free_inode(struct inode * inode);
  51 extern unsigned long minix_count_free_inodes(struct super_block *sb);
  52 extern int minix_new_block(struct inode * inode);
  53 extern void minix_free_block(struct inode *inode, unsigned long block);
  54 extern unsigned long minix_count_free_blocks(struct super_block *sb);
  55 extern int minix_getattr(const struct path *, struct kstat *, u32, unsigned int);
  56 extern int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len);
  57
  58 extern void V1_minix_truncate(struct inode *);
  59 extern void V2_minix_truncate(struct inode *);
  60 extern void minix_truncate(struct inode *);
  61 extern void minix_set_inode(struct inode *, dev_t);
  62 extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int);
  63 extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int);
  64 extern unsigned V1_minix_blocks(loff_t, struct super_block *);
  65 extern unsigned V2_minix_blocks(loff_t, struct super_block *);
  66
  67 extern struct minix_dir_entry *minix_find_entry(struct dentry*, struct page**);
  68 extern int minix_add_link(struct dentry*, struct inode*);
  69 extern int minix_delete_entry(struct minix_dir_entry*, struct page*);
  70 extern int minix_make_empty(struct inode*, struct inode*);
  71 extern int minix_empty_dir(struct inode*);
  72 extern void minix_set_link(struct minix_dir_entry*, struct page*, struct inode*);
  73 extern struct minix_dir_entry *minix_dotdot(struct inode*, struct page**);
  74 extern ino_t minix_inode_by_name(struct dentry*);
  75
  76 extern const struct inode_operations minix_file_inode_operations;
  77 extern const struct inode_operations minix_dir_inode_operations;
  78 extern const struct file_operations minix_file_operations;
  79 extern const struct file_operations minix_dir_operations;
  80
  81 static inline struct minix_sb_info *minix_sb(struct super_block *sb)
  82 {
  83         return sb->s_fs_info;
  84 }
  85
  86 static inline struct minix_inode_info *minix_i(struct inode *inode)
  87 {
  88         return container_of(inode, struct minix_inode_info, vfs_inode);
  89 }
  90
  91 static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize)
  92 {
  93         return DIV_ROUND_UP(bits, blocksize * 8);
  94 }
  95
  96 #if defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) && \
  97         defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
  98
  99 #error Minix file system byte order broken
 100
 101 #elif defined(CONFIG_MINIX_FS_NATIVE_ENDIAN)
 102
 103 /*
 104  * big-endian 32 or 64 bit indexed bitmaps on big-endian system or
 105  * little-endian bitmaps on little-endian system
 106  */
 107
 108 #define minix_test_and_set_bit(nr, addr)        \
 109         __test_and_set_bit((nr), (unsigned long *)(addr))
 110 #define minix_set_bit(nr, addr)         \
 111         __set_bit((nr), (unsigned long *)(addr))
 112 #define minix_test_and_clear_bit(nr, addr) \
 113         __test_and_clear_bit((nr), (unsigned long *)(addr))
 114 #define minix_test_bit(nr, addr)                \
 115         test_bit((nr), (unsigned long *)(addr))
 116 #define minix_find_first_zero_bit(addr, size) \
 117         find_first_zero_bit((unsigned long *)(addr), (size))
 118
 119 #elif defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
 120
 121 /*
 122  * big-endian 16bit indexed bitmaps
 123  */
 124
 125 static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)
 126 {
 127         const unsigned short *p = vaddr, *addr = vaddr;
 128         unsigned short num;
 129
 130         if (!size)
 131                 return 0;
 132
 133         size >>= 4;
 134         while (*p++ == 0xffff) {
 135                 if (--size == 0)
 136                         return (p - addr) << 4;
 137         }
 138
 139         num = *--p;
 140         return ((p - addr) << 4) + ffz(num);
 141 }
 142
 143 #define minix_test_and_set_bit(nr, addr)        \
 144         __test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
 145 #define minix_set_bit(nr, addr) \
 146         __set_bit((nr) ^ 16, (unsigned long *)(addr))
 147 #define minix_test_and_clear_bit(nr, addr)      \
 148         __test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr))
 149
 150 static inline int minix_test_bit(int nr, const void *vaddr)
 151 {
 152         const unsigned short *p = vaddr;
 153         return (p[nr >> 4] & (1U << (nr & 15))) != 0;
 154 }
 155
 156 #else
 157
 158 /*
 159  * little-endian bitmaps
 160  */
 161
 162 #define minix_test_and_set_bit  __test_and_set_bit_le
 163 #define minix_set_bit           __set_bit_le
 164 #define minix_test_and_clear_bit        __test_and_clear_bit_le
 165 #define minix_test_bit  test_bit_le
 166 #define minix_find_first_zero_bit       find_first_zero_bit_le
 167
 168 #endif
 169
 170 #endif /* FS_MINIX_H */