minix.h (5349B)
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 */ 17struct 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 */ 28struct 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 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 user_namespace *, const struct path *, 55 struct kstat *, u32, unsigned int); 56extern int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len); 57 58extern void V1_minix_truncate(struct inode *); 59extern void V2_minix_truncate(struct inode *); 60extern void minix_truncate(struct inode *); 61extern void minix_set_inode(struct inode *, dev_t); 62extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int); 63extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int); 64extern unsigned V1_minix_blocks(loff_t, struct super_block *); 65extern unsigned V2_minix_blocks(loff_t, struct super_block *); 66 67extern struct minix_dir_entry *minix_find_entry(struct dentry*, struct page**); 68extern int minix_add_link(struct dentry*, struct inode*); 69extern int minix_delete_entry(struct minix_dir_entry*, struct page*); 70extern int minix_make_empty(struct inode*, struct inode*); 71extern int minix_empty_dir(struct inode*); 72extern void minix_set_link(struct minix_dir_entry*, struct page*, struct inode*); 73extern struct minix_dir_entry *minix_dotdot(struct inode*, struct page**); 74extern ino_t minix_inode_by_name(struct dentry*); 75 76extern const struct inode_operations minix_file_inode_operations; 77extern const struct inode_operations minix_dir_inode_operations; 78extern const struct file_operations minix_file_operations; 79extern const struct file_operations minix_dir_operations; 80 81static inline struct minix_sb_info *minix_sb(struct super_block *sb) 82{ 83 return sb->s_fs_info; 84} 85 86static inline struct minix_inode_info *minix_i(struct inode *inode) 87{ 88 return container_of(inode, struct minix_inode_info, vfs_inode); 89} 90 91static 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 125static 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 150static 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 */