/* SPDX-License-Identifier: GPL-2.0 */ #ifndef FS_MINIX_H #define FS_MINIX_H #include <linux/fs.h> #include <linux/pagemap.h> #include <linux/minix_fs.h> #define INODE_VERSION(inode) minix_sb(inode->i_sb)->s_version #define MINIX_V1 0x0001 /* original minix fs */ #define MINIX_V2 0x0002 /* minix V2 fs */ #define MINIX_V3 0x0003 /* minix V3 fs */ /* * minix fs inode data in memory */ struct minix_inode_info { union { __u16 i1_data[16]; __u32 i2_data[16]; } u; struct inode vfs_inode; }; /* * minix super-block data in memory */ struct minix_sb_info { unsigned long s_ninodes; unsigned long s_nzones; unsigned long s_imap_blocks; unsigned long s_zmap_blocks; unsigned long s_firstdatazone; unsigned long s_log_zone_size; unsigned long s_max_size; int s_dirsize; int s_namelen; struct buffer_head ** s_imap; struct buffer_head ** s_zmap; struct buffer_head * s_sbh; struct minix_super_block * s_ms; unsigned short s_mount_state; unsigned short s_version; }; extern struct inode *minix_iget(struct super_block *, unsigned long); extern struct minix_inode * minix_V1_raw_inode(struct super_block *, ino_t, struct buffer_head **); extern struct minix2_inode * minix_V2_raw_inode(struct super_block *, ino_t, struct buffer_head **); extern struct inode * minix_new_inode(const struct inode *, umode_t, int *); extern void minix_free_inode(struct inode * inode); extern unsigned long minix_count_free_inodes(struct super_block *sb); extern int minix_new_block(struct inode * inode); extern void minix_free_block(struct inode *inode, unsigned long block); extern unsigned long minix_count_free_blocks(struct super_block *sb); extern int minix_getattr(const struct path *, struct kstat *, u32, unsigned int); extern int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len); extern void V1_minix_truncate(struct inode *); extern void V2_minix_truncate(struct inode *); extern void minix_truncate(struct inode *); extern void minix_set_inode(struct inode *, dev_t); extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int); extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int); extern unsigned V1_minix_blocks(loff_t, struct super_block *); extern unsigned V2_minix_blocks(loff_t, struct super_block *); extern struct minix_dir_entry *minix_find_entry(struct dentry*, struct page**); extern int minix_add_link(struct dentry*, struct inode*); extern int minix_delete_entry(struct minix_dir_entry*, struct page*); extern int minix_make_empty(struct inode*, struct inode*); extern int minix_empty_dir(struct inode*); extern void minix_set_link(struct minix_dir_entry*, struct page*, struct inode*); extern struct minix_dir_entry *minix_dotdot(struct inode*, struct page**); extern ino_t minix_inode_by_name(struct dentry*); extern const struct inode_operations minix_file_inode_operations; extern const struct inode_operations minix_dir_inode_operations; extern const struct file_operations minix_file_operations; extern const struct file_operations minix_dir_operations; static inline struct minix_sb_info *minix_sb(struct super_block *sb) { return sb->s_fs_info; } static inline struct minix_inode_info *minix_i(struct inode *inode) { return container_of(inode, struct minix_inode_info, vfs_inode); } static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize) { return DIV_ROUND_UP(bits, blocksize * 8); } #if defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) && \ defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED) #error Minix file system byte order broken #elif defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) /* * big-endian 32 or 64 bit indexed bitmaps on big-endian system or * little-endian bitmaps on little-endian system */ #define minix_test_and_set_bit(nr, addr) \ __test_and_set_bit((nr), (unsigned long *)(addr)) #define minix_set_bit(nr, addr) \ __set_bit((nr), (unsigned long *)(addr)) #define minix_test_and_clear_bit(nr, addr) \ __test_and_clear_bit((nr), (unsigned long *)(addr)) #define minix_test_bit(nr, addr) \ test_bit((nr), (unsigned long *)(addr)) #define minix_find_first_zero_bit(addr, size) \ find_first_zero_bit((unsigned long *)(addr), (size)) #elif defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED) /* * big-endian 16bit indexed bitmaps */ static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size) { const unsigned short *p = vaddr, *addr = vaddr; unsigned short num; if (!size) return 0; size >>= 4; while (*p++ == 0xffff) { if (--size == 0) return (p - addr) << 4; } num = *--p; return ((p - addr) << 4) + ffz(num); } #define minix_test_and_set_bit(nr, addr) \ __test_and_set_bit((nr) ^ 16, (unsigned long *)(addr)) #define minix_set_bit(nr, addr) \ __set_bit((nr) ^ 16, (unsigned long *)(addr)) #define minix_test_and_clear_bit(nr, addr) \ __test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr)) static inline int minix_test_bit(int nr, const void *vaddr) { const unsigned short *p = vaddr; return (p[nr >> 4] & (1U << (nr & 15))) != 0; } #else /* * little-endian bitmaps */ #define minix_test_and_set_bit __test_and_set_bit_le #define minix_set_bit __set_bit_le #define minix_test_and_clear_bit __test_and_clear_bit_le #define minix_test_bit test_bit_le #define minix_find_first_zero_bit find_first_zero_bit_le #endif #endif /* FS_MINIX_H */