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 void __minix_error_inode(struct inode *inode, const char *function, 46 unsigned int line, const char *fmt, ...); 47 48 struct inode *minix_iget(struct super_block *, unsigned long); 49 struct minix_inode *minix_V1_raw_inode(struct super_block *, ino_t, struct buffer_head **); 50 struct minix2_inode *minix_V2_raw_inode(struct super_block *, ino_t, struct buffer_head **); 51 struct inode *minix_new_inode(const struct inode *, umode_t); 52 void minix_free_inode(struct inode *inode); 53 unsigned long minix_count_free_inodes(struct super_block *sb); 54 int minix_new_block(struct inode *inode); 55 void minix_free_block(struct inode *inode, unsigned long block); 56 unsigned long minix_count_free_blocks(struct super_block *sb); 57 int minix_getattr(struct mnt_idmap *, const struct path *, 58 struct kstat *, u32, unsigned int); 59 int minix_prepare_chunk(struct folio *folio, loff_t pos, unsigned len); 60 61 extern void V1_minix_truncate(struct inode *); 62 extern void V2_minix_truncate(struct inode *); 63 extern void minix_truncate(struct inode *); 64 extern void minix_set_inode(struct inode *, dev_t); 65 extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int); 66 extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int); 67 extern unsigned V1_minix_blocks(loff_t, struct super_block *); 68 extern unsigned V2_minix_blocks(loff_t, struct super_block *); 69 70 struct minix_dir_entry *minix_find_entry(struct dentry *, struct folio **); 71 int minix_add_link(struct dentry*, struct inode*); 72 int minix_delete_entry(struct minix_dir_entry *, struct folio *); 73 int minix_make_empty(struct inode*, struct inode*); 74 int minix_empty_dir(struct inode*); 75 int minix_set_link(struct minix_dir_entry *de, struct folio *folio, 76 struct inode *inode); 77 struct minix_dir_entry *minix_dotdot(struct inode*, struct folio **); 78 ino_t minix_inode_by_name(struct dentry*); 79 80 extern const struct inode_operations minix_file_inode_operations; 81 extern const struct inode_operations minix_dir_inode_operations; 82 extern const struct file_operations minix_file_operations; 83 extern const struct file_operations minix_dir_operations; 84 85 static inline struct minix_sb_info *minix_sb(struct super_block *sb) 86 { 87 return sb->s_fs_info; 88 } 89 90 static inline struct minix_inode_info *minix_i(struct inode *inode) 91 { 92 return container_of(inode, struct minix_inode_info, vfs_inode); 93 } 94 95 static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize) 96 { 97 return DIV_ROUND_UP(bits, blocksize * 8); 98 } 99 100 #if defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) && \ 101 defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED) 102 103 #error Minix file system byte order broken 104 105 #elif defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) 106 107 /* 108 * big-endian 32 or 64 bit indexed bitmaps on big-endian system or 109 * little-endian bitmaps on little-endian system 110 */ 111 112 #define minix_test_and_set_bit(nr, addr) \ 113 __test_and_set_bit((nr), (unsigned long *)(addr)) 114 #define minix_set_bit(nr, addr) \ 115 __set_bit((nr), (unsigned long *)(addr)) 116 #define minix_test_and_clear_bit(nr, addr) \ 117 __test_and_clear_bit((nr), (unsigned long *)(addr)) 118 #define minix_test_bit(nr, addr) \ 119 test_bit((nr), (unsigned long *)(addr)) 120 #define minix_find_first_zero_bit(addr, size) \ 121 find_first_zero_bit((unsigned long *)(addr), (size)) 122 123 #elif defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED) 124 125 /* 126 * big-endian 16bit indexed bitmaps 127 */ 128 129 static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size) 130 { 131 const unsigned short *p = vaddr, *addr = vaddr; 132 unsigned short num; 133 134 if (!size) 135 return 0; 136 137 size >>= 4; 138 while (*p++ == 0xffff) { 139 if (--size == 0) 140 return (p - addr) << 4; 141 } 142 143 num = *--p; 144 return ((p - addr) << 4) + ffz(num); 145 } 146 147 #define minix_test_and_set_bit(nr, addr) \ 148 __test_and_set_bit((nr) ^ 16, (unsigned long *)(addr)) 149 #define minix_set_bit(nr, addr) \ 150 __set_bit((nr) ^ 16, (unsigned long *)(addr)) 151 #define minix_test_and_clear_bit(nr, addr) \ 152 __test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr)) 153 154 static inline int minix_test_bit(int nr, const void *vaddr) 155 { 156 const unsigned short *p = vaddr; 157 return (p[nr >> 4] & (1U << (nr & 15))) != 0; 158 } 159 160 #else 161 162 /* 163 * little-endian bitmaps 164 */ 165 166 #define minix_test_and_set_bit __test_and_set_bit_le 167 #define minix_set_bit __set_bit_le 168 #define minix_test_and_clear_bit __test_and_clear_bit_le 169 #define minix_test_bit test_bit_le 170 #define minix_find_first_zero_bit find_first_zero_bit_le 171 172 #endif 173 174 #define minix_error_inode(inode, fmt, ...) \ 175 __minix_error_inode((inode), __func__, __LINE__, \ 176 (fmt), ##__VA_ARGS__) 177 178 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 179 180 #endif /* FS_MINIX_H */ 181