util.h

UnixBSD、SunOs、FreeBSD、NetBSD、OpenBSD和NeXTStep文件系统源代码

/*
 *  linux/fs/ufs/util.h
 *
 * Copyright (C) 1998 
 * Daniel Pirkl <[e-mail]>
 * Charles University, Faculty of Mathematics and Physics
 */

#include <linux/buffer_head.h>
#include <linux/fs.h>
#include "swab.h"


/*
 * some useful macros
 */
#define in_range(b,first,len)	((b)>=(first)&&(b)<(first)+(len))

/*
 * functions used for retyping
 */
static inline struct ufs_buffer_head *UCPI_UBH(struct ufs_cg_private_info *cpi)
{
	return &cpi->c_ubh;
}
static inline struct ufs_buffer_head *USPI_UBH(struct ufs_sb_private_info *spi)
{
	return &spi->s_ubh;
}



/*
 * macros used for accessing structures
 */
static inline s32
ufs_get_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
		 struct ufs_super_block_third *usb3)
{
	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
	case UFS_ST_SUNOS:
		if (fs32_to_cpu(sb, usb3->fs_postblformat) == UFS_42POSTBLFMT)
			return fs32_to_cpu(sb, usb1->fs_u0.fs_sun.fs_state);
		/* Fall Through to UFS_ST_SUN */
	case UFS_ST_SUN:
		return fs32_to_cpu(sb, usb3->fs_un2.fs_sun.fs_state);
	case UFS_ST_SUNx86:
		return fs32_to_cpu(sb, usb1->fs_u1.fs_sunx86.fs_state);
	case UFS_ST_44BSD:
	default:
		return fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_state);
	}
}

static inline void
ufs_set_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
		 struct ufs_super_block_third *usb3, s32 value)
{
	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
	case UFS_ST_SUNOS:
		if (fs32_to_cpu(sb, usb3->fs_postblformat) == UFS_42POSTBLFMT) {
			usb1->fs_u0.fs_sun.fs_state = cpu_to_fs32(sb, value);
			break;
		}
		/* Fall Through to UFS_ST_SUN */
	case UFS_ST_SUN:
		usb3->fs_un2.fs_sun.fs_state = cpu_to_fs32(sb, value);
		break;
	case UFS_ST_SUNx86:
		usb1->fs_u1.fs_sunx86.fs_state = cpu_to_fs32(sb, value);
		break;
	case UFS_ST_44BSD:
		usb3->fs_un2.fs_44.fs_state = cpu_to_fs32(sb, value);
		break;
	}
}

static inline u32
ufs_get_fs_npsect(struct super_block *sb, struct ufs_super_block_first *usb1,
		  struct ufs_super_block_third *usb3)
{
	if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
		return fs32_to_cpu(sb, usb3->fs_un2.fs_sunx86.fs_npsect);
	else
		return fs32_to_cpu(sb, usb1->fs_u1.fs_sun.fs_npsect);
}

static inline u64
ufs_get_fs_qbmask(struct super_block *sb, struct ufs_super_block_third *usb3)
{
	__fs64 tmp;

	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
	case UFS_ST_SUNOS:
	case UFS_ST_SUN:
		((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sun.fs_qbmask[0];
		((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sun.fs_qbmask[1];
		break;
	case UFS_ST_SUNx86:
		((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sunx86.fs_qbmask[0];
		((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sunx86.fs_qbmask[1];
		break;
	case UFS_ST_44BSD:
		((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_44.fs_qbmask[0];
		((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_44.fs_qbmask[1];
		break;
	}

	return fs64_to_cpu(sb, tmp);
}

static inline u64
ufs_get_fs_qfmask(struct super_block *sb, struct ufs_super_block_third *usb3)
{
	__fs64 tmp;

	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
	case UFS_ST_SUNOS:
	case UFS_ST_SUN:
		((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sun.fs_qfmask[0];
		((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sun.fs_qfmask[1];
		break;
	case UFS_ST_SUNx86:
		((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sunx86.fs_qfmask[0];
		((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sunx86.fs_qfmask[1];
		break;
	case UFS_ST_44BSD:
		((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_44.fs_qfmask[0];
		((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_44.fs_qfmask[1];
		break;
	}

	return fs64_to_cpu(sb, tmp);
}

static inline u16
ufs_get_de_namlen(struct super_block *sb, struct ufs_dir_entry *de)
{
	if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
		return fs16_to_cpu(sb, de->d_u.d_namlen);
	else
		return de->d_u.d_44.d_namlen; /* XXX this seems wrong */
}

static inline void
ufs_set_de_namlen(struct super_block *sb, struct ufs_dir_entry *de, u16 value)
{
	if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
		de->d_u.d_namlen = cpu_to_fs16(sb, value);
	else
		de->d_u.d_44.d_namlen = value; /* XXX this seems wrong */
}

static inline void
ufs_set_de_type(struct super_block *sb, struct ufs_dir_entry *de, int mode)
{
	if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) != UFS_DE_44BSD)
		return;

	/*
	 * TODO turn this into a table lookup
	 */
	switch (mode & S_IFMT) {
	case S_IFSOCK:
		de->d_u.d_44.d_type = DT_SOCK;
		break;
	case S_IFLNK:
		de->d_u.d_44.d_type = DT_LNK;
		break;
	case S_IFREG:
		de->d_u.d_44.d_type = DT_REG;
		break;
	case S_IFBLK:
		de->d_u.d_44.d_type = DT_BLK;
		break;
	case S_IFDIR:
		de->d_u.d_44.d_type = DT_DIR;
		break;
	case S_IFCHR:
		de->d_u.d_44.d_type = DT_CHR;
		break;
	case S_IFIFO:
		de->d_u.d_44.d_type = DT_FIFO;
		break;
	default:
		de->d_u.d_44.d_type = DT_UNKNOWN;
	}
}

static inline u32
ufs_get_inode_uid(struct super_block *sb, struct ufs_inode *inode)
{
	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
	case UFS_UID_44BSD:
		return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_uid);
	case UFS_UID_EFT:
		if (inode->ui_u1.oldids.ui_suid == 0xFFFF)
			return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_uid);
		/* Fall through */
	default:
		return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_suid);
	}
}

static inline void
ufs_set_inode_uid(struct super_block *sb, struct ufs_inode *inode, u32 value)
{
	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
	case UFS_UID_44BSD:
		inode->ui_u3.ui_44.ui_uid = cpu_to_fs32(sb, value);
		inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value);
		break;
	case UFS_UID_EFT:
		inode->ui_u3.ui_sun.ui_uid = cpu_to_fs32(sb, value);
		if (value > 0xFFFF)
			value = 0xFFFF;
		/* Fall through */
	default:
		inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value);
		break;
	}
}

static inline u32
ufs_get_inode_gid(struct super_block *sb, struct ufs_inode *inode)
{
	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
	case UFS_UID_44BSD:
		return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_gid);
	case UFS_UID_EFT:
		if (inode->ui_u1.oldids.ui_suid == 0xFFFF)
			return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_gid);
		/* Fall through */
	default:
		return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_sgid);
	}
}

static inline void
ufs_set_inode_gid(struct super_block *sb, struct ufs_inode *inode, u32 value)
{
	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
	case UFS_UID_44BSD:
		inode->ui_u3.ui_44.ui_gid = cpu_to_fs32(sb, value);
		inode->ui_u1.oldids.ui_sgid =  cpu_to_fs16(sb, value);
		break;
	case UFS_UID_EFT:
		inode->ui_u3.ui_sun.ui_gid = cpu_to_fs32(sb, value);
		if (value > 0xFFFF)
			value = 0xFFFF;
		/* Fall through */
	default:
		inode->ui_u1.oldids.ui_sgid =  cpu_to_fs16(sb, value);
		break;
	}
}

extern dev_t ufs_get_inode_dev(struct super_block *, struct ufs_inode_info *);
extern void ufs_set_inode_dev(struct super_block *, struct ufs_inode_info *, dev_t);
extern int __ufs_write_begin(struct file *file, struct address_space *mapping,
		loff_t pos, unsigned len, unsigned flags,
		struct page **pagep, void **fsdata);

/*
 * These functions manipulate ufs buffers
 */
#define ubh_bread(sb,fragment,size) _ubh_bread_(uspi,sb,fragment,size)  
extern struct ufs_buffer_head * _ubh_bread_(struct ufs_sb_private_info *, struct super_block *, u64 , u64);
extern struct ufs_buffer_head * ubh_bread_uspi(struct ufs_sb_private_info *, struct super_block *, u64, u64);
extern void ubh_brelse (struct ufs_buffer_head *);
extern void ubh_brelse_uspi (struct ufs_sb_private_info *);
extern void ubh_mark_buffer_dirty (struct ufs_buffer_head *);
extern void ubh_mark_buffer_uptodate (struct ufs_buffer_head *, int);
extern void ubh_ll_rw_block(int, struct ufs_buffer_head *);
extern void ubh_wait_on_buffer (struct ufs_buffer_head *);
extern void ubh_bforget (struct ufs_buffer_head *);
extern int  ubh_buffer_dirty (struct ufs_buffer_head *);
#define ubh_ubhcpymem(mem,ubh,size) _ubh_ubhcpymem_(uspi,mem,ubh,size)
extern void _ubh_ubhcpymem_(struct ufs_sb_private_info *, unsigned char *, struct ufs_buffer_head *, unsigned);
#define ubh_memcpyubh(ubh,mem,size) _ubh_memcpyubh_(uspi,ubh,mem,size)
extern void _ubh_memcpyubh_(struct ufs_sb_private_info *, struct ufs_buffer_head *, unsigned char *, unsigned);

/* This functions works with cache pages*/
extern struct page *ufs_get_locked_page(struct address_space *mapping,
					pgoff_t index);
static inline void ufs_put_locked_page(struct page *page)
{
       unlock_page(page);
       page_cache_release(page);
}


/*
 * macros and inline function to get important structures from ufs_sb_private_info
 */

static inline void *get_usb_offset(struct ufs_sb_private_info *uspi,
				   unsigned int offset)