fs/minix/minix.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef FS_MINIX_H
0003 #define FS_MINIX_H
0004
0005 #include <linux/fs.h>
0006 #include <linux/pagemap.h>
0007 #include <linux/minix_fs.h>
0008
0009 #define INODE_VERSION(inode)    minix_sb(inode->i_sb)->s_version
0010 #define MINIX_V1        0x0001      /* original minix fs */
0011 #define MINIX_V2        0x0002      /* minix V2 fs */
0012 #define MINIX_V3        0x0003      /* minix V3 fs */
0013
0014 /*
0015  * minix fs inode data in memory
0016  */
0017 struct minix_inode_info {
0018     union {
0019         __u16 i1_data[16];
0020         __u32 i2_data[16];
0021     } u;
0022     struct inode vfs_inode;
0023 };
0024
0025 /*
0026  * minix super-block data in memory
0027  */
0028 struct minix_sb_info {
0029     unsigned long s_ninodes;
0030     unsigned long s_nzones;
0031     unsigned long s_imap_blocks;
0032     unsigned long s_zmap_blocks;
0033     unsigned long s_firstdatazone;
0034     unsigned long s_log_zone_size;
0035     int s_dirsize;
0036     int s_namelen;
0037     struct buffer_head ** s_imap;
0038     struct buffer_head ** s_zmap;
0039     struct buffer_head * s_sbh;
0040     struct minix_super_block * s_ms;
0041     unsigned short s_mount_state;
0042     unsigned short s_version;
0043 };
0044
0045 extern struct inode *minix_iget(struct super_block *, unsigned long);
0046 extern struct minix_inode * minix_V1_raw_inode(struct super_block *, ino_t, struct buffer_head **);
0047 extern struct minix2_inode * minix_V2_raw_inode(struct super_block *, ino_t, struct buffer_head **);
0048 extern struct inode * minix_new_inode(const struct inode *, umode_t, int *);
0049 extern void minix_free_inode(struct inode * inode);
0050 extern unsigned long minix_count_free_inodes(struct super_block *sb);
0051 extern int minix_new_block(struct inode * inode);
0052 extern void minix_free_block(struct inode *inode, unsigned long block);
0053 extern unsigned long minix_count_free_blocks(struct super_block *sb);
0054 extern int minix_getattr(struct user_namespace *, const struct path *,
0055              struct kstat *, u32, unsigned int);
0056 extern int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len);
0057
0058 extern void V1_minix_truncate(struct inode *);
0059 extern void V2_minix_truncate(struct inode *);
0060 extern void minix_truncate(struct inode *);
0061 extern void minix_set_inode(struct inode *, dev_t);
0062 extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int);
0063 extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int);
0064 extern unsigned V1_minix_blocks(loff_t, struct super_block *);
0065 extern unsigned V2_minix_blocks(loff_t, struct super_block *);
0066
0067 extern struct minix_dir_entry *minix_find_entry(struct dentry*, struct page**);
0068 extern int minix_add_link(struct dentry*, struct inode*);
0069 extern int minix_delete_entry(struct minix_dir_entry*, struct page*);
0070 extern int minix_make_empty(struct inode*, struct inode*);
0071 extern int minix_empty_dir(struct inode*);
0072 extern void minix_set_link(struct minix_dir_entry*, struct page*, struct inode*);
0073 extern struct minix_dir_entry *minix_dotdot(struct inode*, struct page**);
0074 extern ino_t minix_inode_by_name(struct dentry*);
0075
0076 extern const struct inode_operations minix_file_inode_operations;
0077 extern const struct inode_operations minix_dir_inode_operations;
0078 extern const struct file_operations minix_file_operations;
0079 extern const struct file_operations minix_dir_operations;
0080
0081 static inline struct minix_sb_info *minix_sb(struct super_block *sb)
0082 {
0083     return sb->s_fs_info;
0084 }
0085
0086 static inline struct minix_inode_info *minix_i(struct inode *inode)
0087 {
0088     return container_of(inode, struct minix_inode_info, vfs_inode);
0089 }
0090
0091 static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize)
0092 {
0093     return DIV_ROUND_UP(bits, blocksize * 8);
0094 }
0095
0096 #if defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) && \
0097     defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
0098
0099 #error Minix file system byte order broken
0100
0101 #elif defined(CONFIG_MINIX_FS_NATIVE_ENDIAN)
0102
0103 /*
0104  * big-endian 32 or 64 bit indexed bitmaps on big-endian system or
0105  * little-endian bitmaps on little-endian system
0106  */
0107
0108 #define minix_test_and_set_bit(nr, addr)    \
0109     __test_and_set_bit((nr), (unsigned long *)(addr))
0110 #define minix_set_bit(nr, addr)     \
0111     __set_bit((nr), (unsigned long *)(addr))
0112 #define minix_test_and_clear_bit(nr, addr) \
0113     __test_and_clear_bit((nr), (unsigned long *)(addr))
0114 #define minix_test_bit(nr, addr)        \
0115     test_bit((nr), (unsigned long *)(addr))
0116 #define minix_find_first_zero_bit(addr, size) \
0117     find_first_zero_bit((unsigned long *)(addr), (size))
0118
0119 #elif defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
0120
0121 /*
0122  * big-endian 16bit indexed bitmaps
0123  */
0124
0125 static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)
0126 {
0127     const unsigned short *p = vaddr, *addr = vaddr;
0128     unsigned short num;
0129
0130     if (!size)
0131         return 0;
0132
0133     size >>= 4;
0134     while (*p++ == 0xffff) {
0135         if (--size == 0)
0136             return (p - addr) << 4;
0137     }
0138
0139     num = *--p;
0140     return ((p - addr) << 4) + ffz(num);
0141 }
0142
0143 #define minix_test_and_set_bit(nr, addr)    \
0144     __test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
0145 #define minix_set_bit(nr, addr) \
0146     __set_bit((nr) ^ 16, (unsigned long *)(addr))
0147 #define minix_test_and_clear_bit(nr, addr)  \
0148     __test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr))
0149
0150 static inline int minix_test_bit(int nr, const void *vaddr)
0151 {
0152     const unsigned short *p = vaddr;
0153     return (p[nr >> 4] & (1U << (nr & 15))) != 0;
0154 }
0155
0156 #else
0157
0158 /*
0159  * little-endian bitmaps
0160  */
0161
0162 #define minix_test_and_set_bit  __test_and_set_bit_le
0163 #define minix_set_bit       __set_bit_le
0164 #define minix_test_and_clear_bit    __test_and_clear_bit_le
0165 #define minix_test_bit  test_bit_le
0166 #define minix_find_first_zero_bit   find_first_zero_bit_le
0167
0168 #endif
0169
0170 #endif /* FS_MINIX_H */