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         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
  45 extern struct inode *minix_iget(struct super_block *, unsigned long);
  46 extern struct minix_inode * minix_V1_raw_inode(struct super_block *, ino_t, struct buffer_head **);
  47 extern struct minix2_inode * minix_V2_raw_inode(struct super_block *, ino_t, struct buffer_head **);
  48 extern struct inode * minix_new_inode(const struct inode *, umode_t, int *);
  49 extern void minix_free_inode(struct inode * inode);
  50 extern unsigned long minix_count_free_inodes(struct super_block *sb);
  51 extern int minix_new_block(struct inode * inode);
  52 extern void minix_free_block(struct inode *inode, unsigned long block);
  53 extern unsigned long minix_count_free_blocks(struct super_block *sb);
  54 extern int minix_getattr(const struct path *, struct kstat *, u32, unsigned int);
  55 extern int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len);
  56
  57 extern void V1_minix_truncate(struct inode *);
  58 extern void V2_minix_truncate(struct inode *);
  59 extern void minix_truncate(struct inode *);
  60 extern void minix_set_inode(struct inode *, dev_t);
  61 extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int);
  62 extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int);
  63 extern unsigned V1_minix_blocks(loff_t, struct super_block *);
  64 extern unsigned V2_minix_blocks(loff_t, struct super_block *);
  65
  66 extern struct minix_dir_entry *minix_find_entry(struct dentry*, struct page**);
  67 extern int minix_add_link(struct dentry*, struct inode*);
  68 extern int minix_delete_entry(struct minix_dir_entry*, struct page*);
  69 extern int minix_make_empty(struct inode*, struct inode*);
  70 extern int minix_empty_dir(struct inode*);
  71 extern void minix_set_link(struct minix_dir_entry*, struct page*, struct inode*);
  72 extern struct minix_dir_entry *minix_dotdot(struct inode*, struct page**);
  73 extern ino_t minix_inode_by_name(struct dentry*);
  74
  75 extern const struct inode_operations minix_file_inode_operations;
  76 extern const struct inode_operations minix_dir_inode_operations;
  77 extern const struct file_operations minix_file_operations;
  78 extern const struct file_operations minix_dir_operations;
  79
  80 static inline struct minix_sb_info *minix_sb(struct super_block *sb)
  81 {
  82         return sb->s_fs_info;
  83 }
  84
  85 static inline struct minix_inode_info *minix_i(struct inode *inode)
  86 {
  87         return container_of(inode, struct minix_inode_info, vfs_inode);
  88 }
  89
  90 static 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
 124 static 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
 149 static 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 */