/*
 * Sync our internal copy of fs_cstotal with disk
 */
static void ufs_put_cstotal(struct super_block *sb)
{
	unsigned mtype = UFS_SB(sb)->s_mount_opt & UFS_MOUNT_UFSTYPE;
	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
	struct ufs_super_block_first *usb1;
	struct ufs_super_block_second *usb2;
	struct ufs_super_block_third *usb3;

	UFSD("ENTER\n");
	usb1 = ubh_get_usb_first(uspi);
	usb2 = ubh_get_usb_second(uspi);
	usb3 = ubh_get_usb_third(uspi);

	if ((mtype == UFS_MOUNT_UFSTYPE_44BSD &&
	     (usb1->fs_flags & UFS_FLAGS_UPDATED)) ||
	    mtype == UFS_MOUNT_UFSTYPE_UFS2) {
		/*we have statistic in different place, then usual*/
		usb2->fs_un.fs_u2.cs_ndir =
			cpu_to_fs64(sb, uspi->cs_total.cs_ndir);
		usb2->fs_un.fs_u2.cs_nbfree =
			cpu_to_fs64(sb, uspi->cs_total.cs_nbfree);
		usb3->fs_un1.fs_u2.cs_nifree =
			cpu_to_fs64(sb, uspi->cs_total.cs_nifree);
		usb3->fs_un1.fs_u2.cs_nffree =
			cpu_to_fs64(sb, uspi->cs_total.cs_nffree);
	} else {
		usb1->fs_cstotal.cs_ndir =
			cpu_to_fs32(sb, uspi->cs_total.cs_ndir);
		usb1->fs_cstotal.cs_nbfree =
			cpu_to_fs32(sb, uspi->cs_total.cs_nbfree);
		usb1->fs_cstotal.cs_nifree =
			cpu_to_fs32(sb, uspi->cs_total.cs_nifree);
		usb1->fs_cstotal.cs_nffree =
			cpu_to_fs32(sb, uspi->cs_total.cs_nffree);
	}
	ubh_mark_buffer_dirty(USPI_UBH(uspi));
	ufs_print_super_stuff(sb, usb1, usb2, usb3);
	UFSD("EXIT\n");
}

static struct buffer_head * sysv_update_inode(struct inode * inode)
{
	struct super_block * sb = inode->i_sb;
	struct sysv_sb_info * sbi = SYSV_SB(sb);
	struct buffer_head * bh;
	struct sysv_inode * raw_inode;
	struct sysv_inode_info * si;
	unsigned int ino, block;

	ino = inode->i_ino;
	if (!ino || ino > sbi->s_ninodes) {
		printk("Bad inode number on dev %s: %d is out of range\n",
		       inode->i_sb->s_id, ino);
		return NULL;
	}
	raw_inode = sysv_raw_inode(sb, ino, &bh);
	if (!raw_inode) {
		printk("unable to read i-node block\n");
		return NULL;
	}

	raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
	raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid));
	raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid));
	raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
	raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
	raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
	raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
	raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);

	si = SYSV_I(inode);
	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
		si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
	for (block = 0; block < 10+1+1+1; block++)
		write3byte(sbi, (u8 *)&si->i_data[block],
			&raw_inode->i_data[3*block]);
	mark_buffer_dirty(bh);
	return bh;
}

void
ufs_set_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi, dev_t dev)
{
	__u32 fs32;

	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
	case UFS_ST_SUNx86:
	case UFS_ST_SUN:
		fs32 = sysv_encode_dev(dev);
		if ((fs32 & 0xffff8000) == 0) {
			fs32 = old_encode_dev(dev);
		}
		break;

	default:
		fs32 = old_encode_dev(dev);
		break;
	}
	if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
		ufsi->i_u1.i_data[1] = cpu_to_fs32(sb, fs32);
	else
		ufsi->i_u1.i_data[0] = cpu_to_fs32(sb, fs32);
}

/*
 * Remove cylinder group from cache, doesn't release memory
 * allocated for cylinder group (this is done at ufs_put_super only).
 */
void ufs_put_cylinder (struct super_block * sb, unsigned bitmap_nr)
{
	struct ufs_sb_info * sbi = UFS_SB(sb);
	struct ufs_sb_private_info * uspi; 
	struct ufs_cg_private_info * ucpi;
	struct ufs_cylinder_group * ucg;
	unsigned i;

	UFSD("ENTER, bitmap_nr %u\n", bitmap_nr);

	uspi = sbi->s_uspi;
	if (sbi->s_cgno[bitmap_nr] == UFS_CGNO_EMPTY) {
		UFSD("EXIT\n");
		return;
	}
	ucpi = sbi->s_ucpi[bitmap_nr];
	ucg = ubh_get_ucg(UCPI_UBH(ucpi));

	if (uspi->s_ncg > UFS_MAX_GROUP_LOADED && bitmap_nr >= sbi->s_cg_loaded) {
		ufs_panic (sb, "ufs_put_cylinder", "internal error");
		return;
	}
	/*
	 * rotor is not so important data, so we put it to disk 
	 * at the end of working with cylinder
	 */
	ucg->cg_rotor = cpu_to_fs32(sb, ucpi->c_rotor);
	ucg->cg_frotor = cpu_to_fs32(sb, ucpi->c_frotor);
	ucg->cg_irotor = cpu_to_fs32(sb, ucpi->c_irotor);
	ubh_mark_buffer_dirty (UCPI_UBH(ucpi));
	for (i = 1; i < UCPI_UBH(ucpi)->count; i++) {
		brelse (UCPI_UBH(ucpi)->bh[i]);
	}

	sbi->s_cgno[bitmap_nr] = UFS_CGNO_EMPTY;
	UFSD("EXIT\n");
}

static int sysv_sync_fs(struct super_block *sb, int wait)
{
	struct sysv_sb_info *sbi = SYSV_SB(sb);
	unsigned long time = get_seconds(), old_time;

	mutex_lock(&sbi->s_lock);

	/*
	 * If we are going to write out the super block,
	 * then attach current time stamp.
	 * But if the filesystem was marked clean, keep it clean.
	 */
	old_time = fs32_to_cpu(sbi, *sbi->s_sb_time);
	if (sbi->s_type == FSTYPE_SYSV4) {
		if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time))
			*sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time);
		*sbi->s_sb_time = cpu_to_fs32(sbi, time);
		mark_buffer_dirty(sbi->s_bh2);
	}

	mutex_unlock(&sbi->s_lock);

	return 0;
}

static struct buffer_head * sysv_update_inode(struct inode * inode)
{
	struct super_block * sb = inode->i_sb;
	struct buffer_head * bh;
	struct sysv_inode * raw_inode;
	unsigned int ino, block;

	ino = inode->i_ino;
	if (!ino || ino > sb->sv_ninodes) {
		printk("Bad inode number on dev %s: %d is out of range\n",
		       inode->i_sb->s_id, ino);
		return 0;
	}
	raw_inode = sysv_raw_inode(sb, ino, &bh);
	if (!raw_inode) {
		printk("unable to read i-node block\n");
		return 0;
	}

	raw_inode->i_mode = cpu_to_fs16(sb, inode->i_mode);
	raw_inode->i_uid = cpu_to_fs16(sb, fs_high2lowuid(inode->i_uid));
	raw_inode->i_gid = cpu_to_fs16(sb, fs_high2lowgid(inode->i_gid));
	raw_inode->i_nlink = cpu_to_fs16(sb, inode->i_nlink);
	raw_inode->i_size = cpu_to_fs32(sb, inode->i_size);
	raw_inode->i_atime = cpu_to_fs32(sb, inode->i_atime);
	raw_inode->i_mtime = cpu_to_fs32(sb, inode->i_mtime);
	raw_inode->i_ctime = cpu_to_fs32(sb, inode->i_ctime);
	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
		inode->u.sysv_i.i_data[0] = 
			cpu_to_fs32(sb, kdev_t_to_nr(inode->i_rdev));
	for (block = 0; block < 10+1+1+1; block++)
		write3byte(sb, (unsigned char*)&inode->u.sysv_i.i_data[block],
			&raw_inode->i_a.i_addb[3*block]);
	mark_buffer_dirty(bh);
	return bh;
}

static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
{
	struct ufs_sb_private_info * uspi;
	struct ufs_super_block_first * usb1;
	struct ufs_super_block_third * usb3;
	unsigned new_mount_opt, ufstype;
	unsigned flags;

	sync_filesystem(sb);
	mutex_lock(&UFS_SB(sb)->s_lock);
	uspi = UFS_SB(sb)->s_uspi;
	flags = UFS_SB(sb)->s_flags;
	usb1 = ubh_get_usb_first(uspi);
	usb3 = ubh_get_usb_third(uspi);
	
	/*
	 * Allow the "check" option to be passed as a remount option.
	 * It is not possible to change ufstype option during remount
	 */
	ufstype = UFS_SB(sb)->s_mount_opt & UFS_MOUNT_UFSTYPE;
	new_mount_opt = 0;
	ufs_set_opt (new_mount_opt, ONERROR_LOCK);
	if (!ufs_parse_options (data, &new_mount_opt)) {
		mutex_unlock(&UFS_SB(sb)->s_lock);
		return -EINVAL;
	}
	if (!(new_mount_opt & UFS_MOUNT_UFSTYPE)) {
		new_mount_opt |= ufstype;
	} else if ((new_mount_opt & UFS_MOUNT_UFSTYPE) != ufstype) {
		pr_err("ufstype can't be changed during remount\n");
		mutex_unlock(&UFS_SB(sb)->s_lock);
		return -EINVAL;
	}

	if ((*mount_flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
		UFS_SB(sb)->s_mount_opt = new_mount_opt;
		mutex_unlock(&UFS_SB(sb)->s_lock);
		return 0;
	}
	
	/*
	 * fs was mouted as rw, remounting ro
	 */
	if (*mount_flags & MS_RDONLY) {
		ufs_put_super_internal(sb);
		usb1->fs_time = cpu_to_fs32(sb, get_seconds());
		if ((flags & UFS_ST_MASK) == UFS_ST_SUN
		  || (flags & UFS_ST_MASK) == UFS_ST_SUNOS
		  || (flags & UFS_ST_MASK) == UFS_ST_SUNx86) 
			ufs_set_fs_state(sb, usb1, usb3,
				UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time));
		ubh_mark_buffer_dirty (USPI_UBH(uspi));
		sb->s_flags |= MS_RDONLY;
	} else {
	/*
	 * fs was mounted as ro, remounting rw
	 */
#ifndef CONFIG_UFS_FS_WRITE
		pr_err("ufs was compiled with read-only support, can't be mounted as read-write\n");
		mutex_unlock(&UFS_SB(sb)->s_lock);
		return -EINVAL;
#else
		if (ufstype != UFS_MOUNT_UFSTYPE_SUN && 
		    ufstype != UFS_MOUNT_UFSTYPE_SUNOS &&
		    ufstype != UFS_MOUNT_UFSTYPE_44BSD &&
		    ufstype != UFS_MOUNT_UFSTYPE_SUNx86 &&
		    ufstype != UFS_MOUNT_UFSTYPE_UFS2) {
			pr_err("this ufstype is read-only supported\n");
			mutex_unlock(&UFS_SB(sb)->s_lock);
			return -EINVAL;
		}
		if (!ufs_read_cylinder_structures(sb)) {
			pr_err("failed during remounting\n");
			mutex_unlock(&UFS_SB(sb)->s_lock);
			return -EPERM;
		}
		sb->s_flags &= ~MS_RDONLY;
#endif
	}
	UFS_SB(sb)->s_mount_opt = new_mount_opt;
	mutex_unlock(&UFS_SB(sb)->s_lock);
	return 0;
}

/*
 * NOTE! When we get the inode, we're the only people
 * that have access to it, and as such there are no
 * race conditions we have to worry about. The inode
 * is not on the hash-lists, and it cannot be reached
 * through the filesystem because the directory entry
 * has been deleted earlier.
 *
 * HOWEVER: we must make sure that we get no aliases,
 * which means that we have to call "clear_inode()"
 * _before_ we mark the inode not in use in the inode
 * bitmaps. Otherwise a newly created file might use
 * the same inode number (not actually the same pointer
 * though), and then we'd have two inodes sharing the
 * same inode number and space on the harddisk.
 */
void ufs_free_inode (struct inode * inode)
{
    struct super_block * sb;
    struct ufs_sb_private_info * uspi;
    struct ufs_super_block_first * usb1;
    struct ufs_cg_private_info * ucpi;
    struct ufs_cylinder_group * ucg;
    int is_directory;
    unsigned ino, cg, bit;
    
    UFSD("ENTER, ino %lu\n", inode->i_ino);

    sb = inode->i_sb;
    uspi = UFS_SB(sb)->s_uspi;
    usb1 = ubh_get_usb_first(uspi);
    
    ino = inode->i_ino;

    lock_super (sb);

    if (!((ino > 1) && (ino < (uspi->s_ncg * uspi->s_ipg )))) {
        ufs_warning(sb, "ufs_free_inode", "reserved inode or nonexistent inode %u\n", ino);
        unlock_super (sb);
        return;
    }
    
    cg = ufs_inotocg (ino);
    bit = ufs_inotocgoff (ino);
    ucpi = ufs_load_cylinder (sb, cg);
    if (!ucpi) {
        unlock_super (sb);
        return;
    }
    ucg = ubh_get_ucg(UCPI_UBH(ucpi));
    if (!ufs_cg_chkmagic(sb, ucg))
        ufs_panic (sb, "ufs_free_fragments", "internal error, bad cg magic number");

    ucg->cg_time = cpu_to_fs32(sb, get_seconds());

    is_directory = S_ISDIR(inode->i_mode);

    DQUOT_FREE_INODE(inode);
    DQUOT_DROP(inode);

    clear_inode (inode);

    if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit))
        ufs_error(sb, "ufs_free_inode", "bit already cleared for inode %u", ino);
    else {
        ubh_clrbit (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit);
        if (ino < ucpi->c_irotor)
            ucpi->c_irotor = ino;
        fs32_add(sb, &ucg->cg_cs.cs_nifree, 1);
        uspi->cs_total.cs_nifree++;
        fs32_add(sb, &UFS_SB(sb)->fs_cs(cg).cs_nifree, 1);

        if (is_directory) {
            fs32_sub(sb, &ucg->cg_cs.cs_ndir, 1);
            uspi->cs_total.cs_ndir--;
            fs32_sub(sb, &UFS_SB(sb)->fs_cs(cg).cs_ndir, 1);
        }
    }

    ubh_mark_buffer_dirty (USPI_UBH(uspi));
    ubh_mark_buffer_dirty (UCPI_UBH(ucpi));
    if (sb->s_flags & MS_SYNCHRONOUS) {
        ubh_ll_rw_block(SWRITE, UCPI_UBH(ucpi));
        ubh_wait_on_buffer (UCPI_UBH(ucpi));
    }
    
    sb->s_dirt = 1;
    unlock_super (sb);
    UFSD("EXIT\n");
}

//.........这里部分代码省略.........
        if (bit + uspi->s_inopb > initediblk &&
            initediblk < fs32_to_cpu(sb, ucg->cg_u.cg_u2.cg_niblk))
            ufs2_init_inodes_chunk(sb, ucpi, ucg);
    }

    fs32_sub(sb, &ucg->cg_cs.cs_nifree, 1);
    uspi->cs_total.cs_nifree--;
    fs32_sub(sb, &sbi->fs_cs(cg).cs_nifree, 1);
    
    if (S_ISDIR(mode)) {
        fs32_add(sb, &ucg->cg_cs.cs_ndir, 1);
        uspi->cs_total.cs_ndir++;
        fs32_add(sb, &sbi->fs_cs(cg).cs_ndir, 1);
    }
    ubh_mark_buffer_dirty (USPI_UBH(uspi));
    ubh_mark_buffer_dirty (UCPI_UBH(ucpi));
    if (sb->s_flags & MS_SYNCHRONOUS) {
        ubh_ll_rw_block(SWRITE, UCPI_UBH(ucpi));
        ubh_wait_on_buffer (UCPI_UBH(ucpi));
    }
    sb->s_dirt = 1;

    inode->i_ino = cg * uspi->s_ipg + bit;
    inode->i_mode = mode;
    inode->i_uid = current->fsuid;
    if (dir->i_mode & S_ISGID) {
        inode->i_gid = dir->i_gid;
        if (S_ISDIR(mode))
            inode->i_mode |= S_ISGID;
    } else
        inode->i_gid = current->fsgid;

    inode->i_blocks = 0;
    inode->i_generation = 0;
    inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
    ufsi->i_flags = UFS_I(dir)->i_flags;
    ufsi->i_lastfrag = 0;
    ufsi->i_shadow = 0;
    ufsi->i_osync = 0;
    ufsi->i_oeftflag = 0;
    ufsi->i_dir_start_lookup = 0;
    memset(&ufsi->i_u1, 0, sizeof(ufsi->i_u1));
    insert_inode_hash(inode);
    mark_inode_dirty(inode);

    if (uspi->fs_magic == UFS2_MAGIC) {
        struct buffer_head *bh;
        struct ufs2_inode *ufs2_inode;

        /*
         * setup birth date, we do it here because of there is no sense
         * to hold it in struct ufs_inode_info, and lose 64 bit
         */
        bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
        if (!bh) {
            ufs_warning(sb, "ufs_read_inode",
                    "unable to read inode %lu\n",
                    inode->i_ino);
            err = -EIO;
            goto fail_remove_inode;
        }
        lock_buffer(bh);
        ufs2_inode = (struct ufs2_inode *)bh->b_data;
        ufs2_inode += ufs_inotofsbo(inode->i_ino);
        ufs2_inode->ui_birthtime = cpu_to_fs64(sb, CURRENT_TIME.tv_sec);
        ufs2_inode->ui_birthnsec = cpu_to_fs32(sb, CURRENT_TIME.tv_nsec);
        mark_buffer_dirty(bh);
        unlock_buffer(bh);
        if (sb->s_flags & MS_SYNCHRONOUS)
            sync_dirty_buffer(bh);
        brelse(bh);
    }

    unlock_super (sb);

    if (DQUOT_ALLOC_INODE(inode)) {
        DQUOT_DROP(inode);
        err = -EDQUOT;
        goto fail_without_unlock;
    }

    UFSD("allocating inode %lu\n", inode->i_ino);
    UFSD("EXIT\n");
    return inode;

fail_remove_inode:
    unlock_super(sb);
fail_without_unlock:
    inode->i_flags |= S_NOQUOTA;
    inode->i_nlink = 0;
    iput(inode);
    UFSD("EXIT (FAILED): err %d\n", err);
    return ERR_PTR(err);
failed:
    unlock_super (sb);
    make_bad_inode(inode);
    iput (inode);
    UFSD("EXIT (FAILED): err %d\n", err);
    return ERR_PTR(err);
}

unsigned long sysv_count_free_blocks(struct super_block * sb)
{
	struct sysv_sb_info * sbi = SYSV_SB(sb);
	int sb_count;
	int count;
	struct buffer_head * bh = NULL;
	sysv_zone_t *blocks;
	unsigned block;
	int n;

	/*
	 * This code does not work at all for AFS (it has a bitmap
	 * free list).  As AFS is supposed to be read-only we just
	 * lie and say it has no free block at all.
	 */
	if (sbi->s_type == FSTYPE_AFS)
		return 0;

	mutex_lock(&sbi->s_lock);
	sb_count = fs32_to_cpu(sbi, *sbi->s_free_blocks);

	if (0)
		goto trust_sb;

	/* this causes a lot of disk traffic ... */
	count = 0;
	n = fs16_to_cpu(sbi, *sbi->s_bcache_count);

	blocks = sbi->s_bcache;
	while (1) {
		sysv_zone_t zone;
		if (n > sbi->s_flc_size)
			goto E2big;
		zone = 0;
		while (n && (zone = blocks[--n]) != 0)
			count++;
		if (zone == 0)
			break;

		block = fs32_to_cpu(sbi, zone);
		if (bh)
			brelse(bh);

		if (block < sbi->s_firstdatazone || block >= sbi->s_nzones)
			goto Einval;

		block += sbi->s_block_base;
		bh = sb_bread(sb, block);
		if (!bh)
			goto Eio;
		n = fs16_to_cpu(sbi, *(__fs16*)bh->b_data);
		blocks = get_chunk(sb, bh);
	}
	if (bh)
		brelse(bh);
	if (count != sb_count)
		goto Ecount;
done:
	mutex_unlock(&sbi->s_lock);
	return count;

Einval:
	printk("sysv_count_free_blocks: new block %u is not in data zone %u %u\n",
		block, sbi->s_firstdatazone, sbi->s_nzones );
	goto trust_sb;
Eio:
	printk("sysv_count_free_blocks: cannot read free-list block\n");
	goto trust_sb;
E2big:
	printk("sysv_count_free_blocks: %d >flc_size %d in free-list block\n", n, sbi->s_flc_size);
	if (bh)
		brelse(bh);
trust_sb:
	count = sb_count;
	goto done;
Ecount:
	printk("sysv_count_free_blocks: free block count was %d, "
		"correcting to %d\n", sb_count, count);
	if (!(sb->s_flags & MS_RDONLY)) {
		*sbi->s_free_blocks = cpu_to_fs32(sbi, count);
		dirty_sb(sb);
	}
	goto done;
}