amigaffs.h

linux得一些常用命令,以及linux环境下的c编程

#ifndef AMIGAFFS_H
#define AMIGAFFS_H

#include <linux/types.h>
#include <linux/locks.h>

#include <asm/byteorder.h>

/* AmigaOS allows file names with up to 30 characters length.
 * Names longer than that will be silently truncated. If you
 * want to disallow this, comment out the following #define.
 * Creating filesystem objects with longer names will then
 * result in an error (ENAMETOOLONG).
 */
/*#define AFFS_NO_TRUNCATE */

/* Ugly macros make the code more pretty. */

#define GET_END_PTR(st,p,sz)		 ((st *)((char *)(p)+((sz)-sizeof(st))))
#define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
#define AFFS_BLOCK(sb, bh, blk)		(AFFS_HEAD(bh)->table[(sb)->u.affs_sb.s_hashsize-1-(blk)])

static inline void
affs_set_blocksize(struct super_block *sb, int size)
{
	set_blocksize(sb->s_dev, size);
	sb->s_blocksize = size;
}
static inline struct buffer_head *
affs_bread(struct super_block *sb, int block)
{
	pr_debug(KERN_DEBUG "affs_bread: %d\n", block);
	if (block >= AFFS_SB->s_reserved && block < AFFS_SB->s_partition_size)
		return sb_bread(sb, block);
	return NULL;
}
static inline struct buffer_head *
affs_getblk(struct super_block *sb, int block)
{
	pr_debug(KERN_DEBUG "affs_getblk: %d\n", block);
	if (block >= AFFS_SB->s_reserved && block < AFFS_SB->s_partition_size)
		return sb_getblk(sb, block);
	return NULL;
}
static inline struct buffer_head *
affs_getzeroblk(struct super_block *sb, int block)
{
	struct buffer_head *bh;
	pr_debug(KERN_DEBUG "affs_getzeroblk: %d\n", block);
	if (block >= AFFS_SB->s_reserved && block < AFFS_SB->s_partition_size) {
		bh = sb_getblk(sb, block);
		lock_buffer(bh);
		memset(bh->b_data, 0 , sb->s_blocksize);
		mark_buffer_uptodate(bh, 1);
		unlock_buffer(bh);
		return bh;
	}
	return NULL;
}
static inline struct buffer_head *
affs_getemptyblk(struct super_block *sb, int block)
{
	struct buffer_head *bh;
	pr_debug(KERN_DEBUG "affs_getemptyblk: %d\n", block);
	if (block >= AFFS_SB->s_reserved && block < AFFS_SB->s_partition_size) {
		bh = sb_getblk(sb, block);
		wait_on_buffer(bh);
		mark_buffer_uptodate(bh, 1);
		return bh;
	}
	return NULL;
}
static inline void
affs_brelse(struct buffer_head *bh)
{
	if (bh)
		pr_debug(KERN_DEBUG "affs_brelse: %ld\n", bh->b_blocknr);
	brelse(bh);
}

static inline void
affs_adjust_checksum(struct buffer_head *bh, u32 val)
{
	u32 tmp = be32_to_cpu(((u32 *)bh->b_data)[5]);
	((u32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
}
static inline void
affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
{
	u32 tmp = be32_to_cpu(((u32 *)bh->b_data)[0]);
	((u32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
}

static inline void
affs_lock_link(struct inode *inode)
{
	down(&AFFS_INODE->i_link_lock);
}
static inline void
affs_unlock_link(struct inode *inode)
{
	up(&AFFS_INODE->i_link_lock);
}
static inline void
affs_lock_dir(struct inode *inode)
{
	down(&AFFS_INODE->i_hash_lock);
}
static inline void
affs_unlock_dir(struct inode *inode)
{
	up(&AFFS_INODE->i_hash_lock);
}
static inline void
affs_lock_ext(struct inode *inode)
{
	down(&AFFS_INODE->i_ext_lock);
}
static inline void
affs_unlock_ext(struct inode *inode)
{
	up(&AFFS_INODE->i_ext_lock);
}

#ifdef __LITTLE_ENDIAN
#define BO_EXBITS	0x18UL
#elif defined(__BIG_ENDIAN)
#define BO_EXBITS	0x00UL
#else
#error Endianness must be known for affs to work.
#endif

#define FS_OFS		0x444F5300
#define FS_FFS		0x444F5301
#define FS_INTLOFS	0x444F5302
#define FS_INTLFFS	0x444F5303
#define FS_DCOFS	0x444F5304
#define FS_DCFFS	0x444F5305
#define MUFS_FS		0x6d754653   /* 'muFS' */
#define MUFS_OFS	0x6d754600   /* 'muF\0' */
#define MUFS_FFS	0x6d754601   /* 'muF\1' */
#define MUFS_INTLOFS	0x6d754602   /* 'muF\2' */
#define MUFS_INTLFFS	0x6d754603   /* 'muF\3' */
#define MUFS_DCOFS	0x6d754604   /* 'muF\4' */
#define MUFS_DCFFS	0x6d754605   /* 'muF\5' */

#define T_SHORT		2
#define T_LIST		16
#define T_DATA		8

#define ST_LINKFILE	-4
#define ST_FILE		-3
#define ST_ROOT		1
#define ST_USERDIR	2
#define ST_SOFTLINK	3
#define ST_LINKDIR	4

#define AFFS_ROOT_BMAPS		25

#define AFFS_HEAD(bh)		((struct affs_head *)(bh)->b_data)
#define AFFS_TAIL(sb, bh)	((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
#define AFFS_ROOT_HEAD(bh)	((struct affs_root_head *)(bh)->b_data)
#define AFFS_ROOT_TAIL(sb, bh)	((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
#define AFFS_DATA_HEAD(bh)	((struct affs_data_head *)(bh)->b_data)
#define AFFS_DATA(bh)		(((struct affs_data_head *)(bh)->b_data)->data)

struct affs_date {
	u32 days;
	u32 mins;
	u32 ticks;
};

struct affs_short_date {
	u16 days;
	u16 mins;
	u16 ticks;
};

struct affs_root_head {
	u32 ptype;
	u32 spare1;
	u32 spare2;
	u32 hash_size;
	u32 spare3;
	u32 checksum;
	u32 hashtable[1];
};

struct affs_root_tail {
	u32 bm_flag;
	u32 bm_blk[AFFS_ROOT_BMAPS];
	u32 bm_ext;
	struct affs_date root_change;
	u8 disk_name[32];
	u32 spare1;
	u32 spare2;
	struct affs_date disk_change;
	struct affs_date disk_create;
	u32 spare3;
	u32 spare4;
	u32 dcache;
	u32 stype;
};

struct affs_head {
	u32 ptype;
	u32 key;
	u32 block_count;
	u32 spare1;
	u32 first_data;
	u32 checksum;
	u32 table[1];
};

struct affs_tail {
	u32 spare1;
	u16 uid;
	u16 gid;
	u32 protect;
	u32 size;
	u8 comment[92];
	struct affs_date change;
	u8 name[32];
	u32 spare2;
	u32 original;
	u32 link_chain;
	u32 spare[5];
	u32 hash_chain;
	u32 parent;
	u32 extension;
	u32 stype;
};

struct slink_front
{
	u32 ptype;
	u32 key;
	u32 spare1[3];
	u32 checksum;
	u8 symname[1];	/* depends on block size */
};

struct affs_data_head
{
	u32 ptype;
	u32 key;
	u32 sequence;
	u32 size;
	u32 next;
	u32 checksum;
	u8 data[1];	/* depends on block size */
};

/* Permission bits */

#define FIBF_OTR_READ		0x8000
#define FIBF_OTR_WRITE		0x4000
#define FIBF_OTR_EXECUTE	0x2000
#define FIBF_OTR_DELETE		0x1000
#define FIBF_GRP_READ		0x0800
#define FIBF_GRP_WRITE		0x0400
#define FIBF_GRP_EXECUTE	0x0200
#define FIBF_GRP_DELETE		0x0100

#define FIBF_HIDDEN		0x0080
#define FIBF_SCRIPT		0x0040
#define FIBF_PURE		0x0020		/* no use under linux */
#define FIBF_ARCHIVED		0x0010		/* never set, always cleared on write */
#define FIBF_NOREAD		0x0008		/* 0 means allowed */
#define FIBF_NOWRITE		0x0004		/* 0 means allowed */
#define FIBF_NOEXECUTE		0x0002		/* 0 means allowed, ignored under linux */
#define FIBF_NODELETE		0x0001		/* 0 means allowed */

#define FIBF_OWNER		0x000F		/* Bits pertaining to owner */
#define FIBF_MASK		0xEE0E		/* Bits modified by Linux */

#endif