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