[linux.git] / fs / minix / minix.h

#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(struct vfsmount *, struct dentry *, struct kstat *);
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 */
Commit	Line	Data
e38be994 HM	1	#ifndef FS_MINIX_H
	2	#define FS_MINIX_H
	3
1da177e4 LT	4	#include <linux/fs.h>
	5	#include <linux/pagemap.h>
	6	#include <linux/minix_fs.h>
	7
1da177e4	8	#define INODE_VERSION(inode) minix_sb(inode->i_sb)->s_version
1da177e4 LT	9	#define MINIX_V1 0x0001 /* original minix fs */
1da177e4 LT	10	#define MINIX_V2 0x0002 /* minix V2 fs */
939b00df	11	#define MINIX_V3 0x0003 /* minix V3 fs */
1da177e4 LT	12
	13	/*
	14	* minix fs inode data in memory
	15	*/
	16	struct minix_inode_info {
	17	union {
	18	__u16 i1_data[16];
	19	__u32 i2_data[16];
	20	} u;
	21	struct inode vfs_inode;
	22	};
	23
	24	/*
	25	* minix super-block data in memory
	26	*/
	27	struct minix_sb_info {
	28	unsigned long s_ninodes;
	29	unsigned long s_nzones;
	30	unsigned long s_imap_blocks;
	31	unsigned long s_zmap_blocks;
	32	unsigned long s_firstdatazone;
	33	unsigned long s_log_zone_size;
	34	unsigned long s_max_size;
	35	int s_dirsize;
	36	int s_namelen;
1da177e4 LT	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
a90a0880	45	extern struct inode minix_iget(struct super_block , unsigned long);
1da177e4 LT	46	extern struct minix_inode * minix_V1_raw_inode(struct super_block , ino_t, struct buffer_head *);
1da177e4 LT	47	extern struct minix2_inode * minix_V2_raw_inode(struct super_block , ino_t, struct buffer_head *);
4f45ba3d	48	extern struct inode * minix_new_inode(const struct inode , umode_t, int );
1da177e4	49	extern void minix_free_inode(struct inode * inode);
016e8d44	50	extern unsigned long minix_count_free_inodes(struct super_block *sb);
1da177e4	51	extern int minix_new_block(struct inode * inode);
939b00df	52	extern void minix_free_block(struct inode *inode, unsigned long block);
016e8d44	53	extern unsigned long minix_count_free_blocks(struct super_block *sb);
1da177e4	54	extern int minix_getattr(struct vfsmount , struct dentry , struct kstat *);
f4e420dc	55	extern int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len);
1da177e4	56
1da177e4 LT	57	extern void V1_minix_truncate(struct inode *);
	58	extern void V2_minix_truncate(struct inode *);
	59	extern void minix_truncate(struct inode *);
1da177e4 LT	60	extern void minix_set_inode(struct inode *, dev_t);
	61	extern int V1_minix_get_block(struct inode , long, struct buffer_head , int);
	62	extern int V2_minix_get_block(struct inode , long, struct buffer_head , int);
939b00df AB	63	extern unsigned V1_minix_blocks(loff_t, struct super_block *);
939b00df AB	64	extern unsigned V2_minix_blocks(loff_t, struct super_block *);
1da177e4 LT	65
	66	extern struct minix_dir_entry minix_find_entry(struct dentry, struct page**);
	67	extern int minix_add_link(struct dentry, struct inode);
	68	extern int minix_delete_entry(struct minix_dir_entry, struct page);
	69	extern int minix_make_empty(struct inode, struct inode);
	70	extern int minix_empty_dir(struct inode*);
	71	extern void minix_set_link(struct minix_dir_entry, struct page, struct inode*);
	72	extern struct minix_dir_entry minix_dotdot(struct inode, struct page**);
	73	extern ino_t minix_inode_by_name(struct dentry*);
1da177e4	74
92e1d5be AV	75	extern const struct inode_operations minix_file_inode_operations;
92e1d5be AV	76	extern const struct inode_operations minix_dir_inode_operations;
4b6f5d20 AV	77	extern const struct file_operations minix_file_operations;
4b6f5d20 AV	78	extern const struct file_operations minix_dir_operations;
1da177e4 LT	79
	80	static inline struct minix_sb_info minix_sb(struct super_block sb)
	81	{
	82	return sb->s_fs_info;
	83	}
	84
	85	static inline struct minix_inode_info minix_i(struct inode inode)
	86	{
db6172c4	87	return container_of(inode, struct minix_inode_info, vfs_inode);
1da177e4	88	}
e38be994	89
016e8d44 JB	90	static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize)
	91	{
	92	return DIV_ROUND_UP(bits, blocksize * 8);
	93	}
	94
61f2e7b0 AM	95	#if defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) && \
	96	defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
	97
	98	#error Minix file system byte order broken
	99
	100	#elif defined(CONFIG_MINIX_FS_NATIVE_ENDIAN)
	101
	102	/*
	103	* big-endian 32 or 64 bit indexed bitmaps on big-endian system or
	104	* little-endian bitmaps on little-endian system
	105	*/
	106
	107	#define minix_test_and_set_bit(nr, addr) \
	108	__test_and_set_bit((nr), (unsigned long *)(addr))
	109	#define minix_set_bit(nr, addr) \
	110	__set_bit((nr), (unsigned long *)(addr))
	111	#define minix_test_and_clear_bit(nr, addr) \
	112	__test_and_clear_bit((nr), (unsigned long *)(addr))
	113	#define minix_test_bit(nr, addr) \
	114	test_bit((nr), (unsigned long *)(addr))
	115	#define minix_find_first_zero_bit(addr, size) \
	116	find_first_zero_bit((unsigned long *)(addr), (size))
	117
	118	#elif defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
	119
	120	/*
	121	* big-endian 16bit indexed bitmaps
	122	*/
	123
	124	static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)
	125	{
	126	const unsigned short p = vaddr, addr = vaddr;
	127	unsigned short num;
	128
	129	if (!size)
	130	return 0;
	131
f1fd306a	132	size >>= 4;
61f2e7b0 AM	133	while (*p++ == 0xffff) {
	134	if (--size == 0)
	135	return (p - addr) << 4;
	136	}
	137
	138	num = *--p;
	139	return ((p - addr) << 4) + ffz(num);
	140	}
	141
	142	#define minix_test_and_set_bit(nr, addr) \
	143	__test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
	144	#define minix_set_bit(nr, addr) \
	145	__set_bit((nr) ^ 16, (unsigned long *)(addr))
	146	#define minix_test_and_clear_bit(nr, addr) \
	147	__test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr))
	148
	149	static inline int minix_test_bit(int nr, const void *vaddr)
	150	{
	151	const unsigned short *p = vaddr;
	152	return (p[nr >> 4] & (1U << (nr & 15))) != 0;
	153	}
	154
	155	#else
	156
	157	/*
	158	* little-endian bitmaps
	159	*/
	160
	161	#define minix_test_and_set_bit __test_and_set_bit_le
	162	#define minix_set_bit __set_bit_le
	163	#define minix_test_and_clear_bit __test_and_clear_bit_le
	164	#define minix_test_bit test_bit_le
	165	#define minix_find_first_zero_bit find_first_zero_bit_le
	166
	167	#endif
	168
e38be994	169	#endif /* FS_MINIX_H */