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minix.h
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minix.h
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/* 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;
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(struct user_namespace *, 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 */