super.c

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

	 * Read cylinder group (we read only first fragment from block
	 * at this time) and prepare internal data structures for cg caching.
	 */
	if (!(sbi->s_ucg = kmalloc (sizeof(struct buffer_head *) * uspi->s_ncg, GFP_KERNEL)))
		goto failed;
	for (i = 0; i < uspi->s_ncg; i++) 
		sbi->s_ucg[i] = NULL;
	for (i = 0; i < UFS_MAX_GROUP_LOADED; i++) {
		sbi->s_ucpi[i] = NULL;
		sbi->s_cgno[i] = UFS_CGNO_EMPTY;
	}
	for (i = 0; i < uspi->s_ncg; i++) {
		UFSD("read cg %u\n", i);
		if (!(sbi->s_ucg[i] = sb_bread(sb, ufs_cgcmin(i))))
			goto failed;
		if (!ufs_cg_chkmagic (sb, (struct ufs_cylinder_group *) sbi->s_ucg[i]->b_data))
			goto failed;

		ufs_print_cylinder_stuff(sb, (struct ufs_cylinder_group *) sbi->s_ucg[i]->b_data);
	}
	for (i = 0; i < UFS_MAX_GROUP_LOADED; i++) {
		if (!(sbi->s_ucpi[i] = kmalloc (sizeof(struct ufs_cg_private_info), GFP_KERNEL)))
			goto failed;
		sbi->s_cgno[i] = UFS_CGNO_EMPTY;
	}
	sbi->s_cg_loaded = 0;
	UFSD("EXIT\n");
	return 1;

failed:
	kfree (base);
	if (sbi->s_ucg) {
		for (i = 0; i < uspi->s_ncg; i++)
			if (sbi->s_ucg[i])
				brelse (sbi->s_ucg[i]);
		kfree (sbi->s_ucg);
		for (i = 0; i < UFS_MAX_GROUP_LOADED; i++)
			kfree (sbi->s_ucpi[i]);
	}
	UFSD("EXIT (FAILED)\n");
	return 0;
}

/*
 * 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");
}

/**
 * ufs_put_super_internal() - put on-disk intrenal structures
 * @sb: pointer to super_block structure
 * Put on-disk structures associated with cylinder groups
 * and write them back to disk, also update cs_total on disk
 */
static void ufs_put_super_internal(struct super_block *sb)
{
	struct ufs_sb_info *sbi = UFS_SB(sb);
	struct ufs_sb_private_info *uspi = sbi->s_uspi;
	struct ufs_buffer_head * ubh;
	unsigned char * base, * space;
	unsigned blks, size, i;

	
	UFSD("ENTER\n");
	ufs_put_cstotal(sb);
	size = uspi->s_cssize;
	blks = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
	base = space = (char*) sbi->s_csp;
	for (i = 0; i < blks; i += uspi->s_fpb) {
		size = uspi->s_bsize;
		if (i + uspi->s_fpb > blks)
			size = (blks - i) * uspi->s_fsize;

		ubh = ubh_bread(sb, uspi->s_csaddr + i, size);

		ubh_memcpyubh (ubh, space, size);
		space += size;
		ubh_mark_buffer_uptodate (ubh, 1);
		ubh_mark_buffer_dirty (ubh);
		ubh_brelse (ubh);
	}
	for (i = 0; i < sbi->s_cg_loaded; i++) {
		ufs_put_cylinder (sb, i);
		kfree (sbi->s_ucpi[i]);
	}
	for (; i < UFS_MAX_GROUP_LOADED; i++) 
		kfree (sbi->s_ucpi[i]);
	for (i = 0; i < uspi->s_ncg; i++) 
		brelse (sbi->s_ucg[i]);
	kfree (sbi->s_ucg);
	kfree (base);
	UFSD("EXIT\n");
}

static int ufs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct ufs_sb_info * sbi;
	struct ufs_sb_private_info * uspi;
	struct ufs_super_block_first * usb1;
	struct ufs_super_block_second * usb2;
	struct ufs_super_block_third * usb3;
	struct ufs_buffer_head * ubh;	
	struct inode *inode;
	unsigned block_size, super_block_size;
	unsigned flags;
	unsigned super_block_offset;
	int ret = -EINVAL;

	uspi = NULL;
	ubh = NULL;
	flags = 0;
	
	UFSD("ENTER\n");
		
	sbi = kzalloc(sizeof(struct ufs_sb_info), GFP_KERNEL);
	if (!sbi)
		goto failed_nomem;
	sb->s_fs_info = sbi;

	UFSD("flag %u\n", (int)(sb->s_flags & MS_RDONLY));
	
#ifndef CONFIG_UFS_FS_WRITE
	if (!(sb->s_flags & MS_RDONLY)) {
		printk("ufs was compiled with read-only support, "
		"can't be mounted as read-write\n");
		goto failed;
	}
#endif
	/*
	 * Set default mount options
	 * Parse mount options
	 */
	sbi->s_mount_opt = 0;
	ufs_set_opt (sbi->s_mount_opt, ONERROR_LOCK);
	if (!ufs_parse_options ((char *) data, &sbi->s_mount_opt)) {
		printk("wrong mount options\n");
		goto failed;
	}
	if (!(sbi->s_mount_opt & UFS_MOUNT_UFSTYPE)) {
		if (!silent)
			printk("You didn't specify the type of your ufs filesystem\n\n"
			"mount -t ufs -o ufstype="
			"sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...\n\n"
			">>>WARNING<<< Wrong ufstype may corrupt your filesystem, "
			"default is ufstype=old\n");
		ufs_set_opt (sbi->s_mount_opt, UFSTYPE_OLD);
	}

	uspi = kzalloc(sizeof(struct ufs_sb_private_info), GFP_KERNEL);
	sbi->s_uspi = uspi;
	if (!uspi)
		goto failed;
	uspi->s_dirblksize = UFS_SECTOR_SIZE;
	super_block_offset=UFS_SBLOCK;

	/* Keep 2Gig file limit. Some UFS variants need to override 
	   this but as I don't know which I'll let those in the know loosen
	   the rules */
	switch (sbi->s_mount_opt & UFS_MOUNT_UFSTYPE) {
	case UFS_MOUNT_UFSTYPE_44BSD:
		UFSD("ufstype=44bsd\n");
		uspi->s_fsize = block_size = 512;
		uspi->s_fmask = ~(512 - 1);
		uspi->s_fshift = 9;
		uspi->s_sbsize = super_block_size = 1536;
		uspi->s_sbbase = 0;
		flags |= UFS_DE_44BSD | UFS_UID_44BSD | UFS_ST_44BSD | UFS_CG_44BSD;
		break;
	case UFS_MOUNT_UFSTYPE_UFS2:
		UFSD("ufstype=ufs2\n");
		super_block_offset=SBLOCK_UFS2;
		uspi->s_fsize = block_size = 512;
		uspi->s_fmask = ~(512 - 1);
		uspi->s_fshift = 9;
		uspi->s_sbsize = super_block_size = 1536;
		uspi->s_sbbase =  0;
		flags |= UFS_TYPE_UFS2 | UFS_DE_44BSD | UFS_UID_44BSD | UFS_ST_44BSD | UFS_CG_44BSD;
		break;
		
	case UFS_MOUNT_UFSTYPE_SUN:
		UFSD("ufstype=sun\n");
		uspi->s_fsize = block_size = 1024;
		uspi->s_fmask = ~(1024 - 1);
		uspi->s_fshift = 10;
		uspi->s_sbsize = super_block_size = 2048;
		uspi->s_sbbase = 0;
		uspi->s_maxsymlinklen = 0; /* Not supported on disk */
		flags |= UFS_DE_OLD | UFS_UID_EFT | UFS_ST_SUN | UFS_CG_SUN;
		break;

	case UFS_MOUNT_UFSTYPE_SUNOS:
		UFSD(("ufstype=sunos\n"))
		uspi->s_fsize = block_size = 1024;
		uspi->s_fmask = ~(1024 - 1);
		uspi->s_fshift = 10;
		uspi->s_sbsize = 2048;
		super_block_size = 2048;
		uspi->s_sbbase = 0;
		uspi->s_maxsymlinklen = 0; /* Not supported on disk */
		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_SUNOS | UFS_CG_SUN;
		break;

	case UFS_MOUNT_UFSTYPE_SUNx86:
		UFSD("ufstype=sunx86\n");
		uspi->s_fsize = block_size = 1024;
		uspi->s_fmask = ~(1024 - 1);
		uspi->s_fshift = 10;
		uspi->s_sbsize = super_block_size = 2048;
		uspi->s_sbbase = 0;
		uspi->s_maxsymlinklen = 0; /* Not supported on disk */
		flags |= UFS_DE_OLD | UFS_UID_EFT | UFS_ST_SUNx86 | UFS_CG_SUN;
		break;

	case UFS_MOUNT_UFSTYPE_OLD:
		UFSD("ufstype=old\n");
		uspi->s_fsize = block_size = 1024;
		uspi->s_fmask = ~(1024 - 1);
		uspi->s_fshift = 10;
		uspi->s_sbsize = super_block_size = 2048;
		uspi->s_sbbase = 0;
		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_OLD | UFS_CG_OLD;
		if (!(sb->s_flags & MS_RDONLY)) {
			if (!silent)
				printk(KERN_INFO "ufstype=old is supported read-only\n");
			sb->s_flags |= MS_RDONLY;
		}
		break;
	
	case UFS_MOUNT_UFSTYPE_NEXTSTEP:
		UFSD("ufstype=nextstep\n");
		uspi->s_fsize = block_size = 1024;
		uspi->s_fmask = ~(1024 - 1);
		uspi->s_fshift = 10;
		uspi->s_sbsize = super_block_size = 2048;
		uspi->s_sbbase = 0;
		uspi->s_dirblksize = 1024;
		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_OLD | UFS_CG_OLD;
		if (!(sb->s_flags & MS_RDONLY)) {
			if (!silent)
				printk(KERN_INFO "ufstype=nextstep is supported read-only\n");
			sb->s_flags |= MS_RDONLY;
		}
		break;
	
	case UFS_MOUNT_UFSTYPE_NEXTSTEP_CD:
		UFSD("ufstype=nextstep-cd\n");
		uspi->s_fsize = block_size = 2048;
		uspi->s_fmask = ~(2048 - 1);
		uspi->s_fshift = 11;
		uspi->s_sbsize = super_block_size = 2048;
		uspi->s_sbbase = 0;
		uspi->s_dirblksize = 1024;
		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_OLD | UFS_CG_OLD;
		if (!(sb->s_flags & MS_RDONLY)) {
			if (!silent)
				printk(KERN_INFO "ufstype=nextstep-cd is supported read-only\n");
			sb->s_flags |= MS_RDONLY;
		}
		break;
	
	case UFS_MOUNT_UFSTYPE_OPENSTEP:
		UFSD("ufstype=openstep\n");
		uspi->s_fsize = block_size = 1024;
		uspi->s_fmask = ~(1024 - 1);
		uspi->s_fshift = 10;
		uspi->s_sbsize = super_block_size = 2048;
		uspi->s_sbbase = 0;
		uspi->s_dirblksize = 1024;
		flags |= UFS_DE_44BSD | UFS_UID_44BSD | UFS_ST_44BSD | UFS_CG_44BSD;
		if (!(sb->s_flags & MS_RDONLY)) {
			if (!silent)
				printk(KERN_INFO "ufstype=openstep is supported read-only\n");
			sb->s_flags |= MS_RDONLY;
		}
		break;
	
	case UFS_MOUNT_UFSTYPE_HP:
		UFSD("ufstype=hp\n");
		uspi->s_fsize = block_size = 1024;
		uspi->s_fmask = ~(1024 - 1);
		uspi->s_fshift = 10;
		uspi->s_sbsize = super_block_size = 2048;
		uspi->s_sbbase = 0;
		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_OLD | UFS_CG_OLD;
		if (!(sb->s_flags & MS_RDONLY)) {
			if (!silent)
				printk(KERN_INFO "ufstype=hp is supported read-only\n");
			sb->s_flags |= MS_RDONLY;
 		}
 		break;
	default:
		if (!silent)
			printk("unknown ufstype\n");
		goto failed;
	}
	
again:	
	if (!sb_set_blocksize(sb, block_size)) {
		printk(KERN_ERR "UFS: failed to set blocksize\n");
		goto failed;
	}

	/*
	 * read ufs super block from device
	 */

	ubh = ubh_bread_uspi(uspi, sb, uspi->s_sbbase + super_block_offset/block_size, super_block_size);
	
	if (!ubh) 
            goto failed;

	usb1 = ubh_get_usb_first(uspi);
	usb2 = ubh_get_usb_second(uspi);
	usb3 = ubh_get_usb_third(uspi);

	/* Sort out mod used on SunOS 4.1.3 for fs_state */
	uspi->s_postblformat = fs32_to_cpu(sb, usb3->fs_postblformat);
	if (((flags & UFS_ST_MASK) == UFS_ST_SUNOS) &&
	    (uspi->s_postblformat != UFS_42POSTBLFMT)) {
		flags &= ~UFS_ST_MASK;
		flags |=  UFS_ST_SUN;
	}

	/*
	 * Check ufs magic number
	 */
	sbi->s_bytesex = BYTESEX_LE;
	switch ((uspi->fs_magic = fs32_to_cpu(sb, usb3->fs_magic))) {
		case UFS_MAGIC:
		case UFS2_MAGIC:
		case UFS_MAGIC_LFN:
	        case UFS_MAGIC_FEA:
	        case UFS_MAGIC_4GB:
			goto magic_found;
	}
	sbi->s_bytesex = BYTESEX_BE;
	switch ((uspi->fs_magic = fs32_to_cpu(sb, usb3->fs_magic))) {
		case UFS_MAGIC:
		case UFS2_MAGIC:
		case UFS_MAGIC_LFN:
	        case UFS_MAGIC_FEA:
	        case UFS_MAGIC_4GB:
			goto magic_found;
	}

	if ((((sbi->s_mount_opt & UFS_MOUNT_UFSTYPE) == UFS_MOUNT_UFSTYPE_NEXTSTEP) 
	  || ((sbi->s_mount_opt & UFS_MOUNT_UFSTYPE) == UFS_MOUNT_UFSTYPE_NEXTSTEP_CD) 
	  || ((sbi->s_mount_opt & UFS_MOUNT_UFSTYPE) == UFS_MOUNT_UFSTYPE_OPENSTEP)) 
	  && uspi->s_sbbase < 256) {
		ubh_brelse_uspi(uspi);
		ubh = NULL;
		uspi->s_sbbase += 8;
		goto again;
	}
	if (!silent)
		printk("ufs_read_super: bad magic number\n");
	goto failed;

magic_found:
	/*
	 * Check block and fragment sizes
	 */
	uspi->s_bsize = fs32_to_cpu(sb, usb1->fs_bsize);
	uspi->s_fsize = fs32_to_cpu(sb, usb1->fs_fsize);
	uspi->s_sbsize = fs32_to_cpu(sb, usb1->fs_sbsize);
	uspi->s_fmask = fs32_to_cpu(sb, usb1->fs_fmask);
	uspi->s_fshift = fs32_to_cpu(sb, usb1->fs_fshift);

	if (!is_power_of_2(uspi->s_fsize)) {
		printk(KERN_ERR "ufs_read_super: fragment size %u is not a power of 2\n",
			uspi->s_fsize);
			goto failed;
	}
	if (uspi->s_fsize < 512) {
		printk(KERN_ERR "ufs_read_super: fragment size %u is too small\n",
			uspi->s_fsize);
		goto failed;
	}
	if (uspi->s_fsize > 4096) {
		printk(KERN_ERR "ufs_read_super: fragment size %u is too large\n",
			uspi->s_fsize);
		goto failed;
	}
	if (!is_power_of_2(uspi->s_bsize)) {
		printk(KERN_ERR "ufs_read_super: block size %u is not a power of 2\n",
			uspi->s_bsize);
		goto failed;
	}
	if (uspi->s_bsize < 4096) {
		printk(KERN_ERR "ufs_read_super: block size %u is too small\n",
			uspi->s_bsize);
		goto failed;
	}
	if (uspi->s_bsize / uspi->s_fsize > 8) {
		printk(KERN_ERR "ufs_read_super: too many fragments per block (%u)\n",
			uspi->s_bsize / uspi->s_fsize);
		goto failed;
	}
	if (uspi->s_fsize != block_size || uspi->s_sbsize != super_block_size) {
		ubh_brelse_uspi(uspi);
		ubh = NULL;
		block_size = uspi->s_fsize;
		super_block_size = uspi->s_sbsize;
		UFSD("another value of block_size or super_block_size %u, %u\n", block_size, super_block_size);
		goto again;
	}

	sbi->s_flags = flags;/*after that line some functions use s_flags*/
	ufs_print_super_stuff(sb, usb1, usb2, usb3);

	/*
	 * Check, if file system was correctly unmounted.
	 * If not, make it read only.
	 */
	if (((flags & UFS_ST_MASK) == UFS_ST_44BSD) ||
	  ((flags & UFS_ST_MASK) == UFS_ST_OLD) ||
	  (((flags & UFS_ST_MASK) == UFS_ST_SUN ||
	    (flags & UFS_ST_MASK) == UFS_ST_SUNOS ||
	  (flags & UFS_ST_MASK) == UFS_ST_SUNx86) &&
	  (ufs_get_fs_state(sb, usb1, usb3) == (UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time))))) {
		switch(usb1->fs_clean) {
		case UFS_FSCLEAN:
			UFSD("fs is clean\n");
			break;
		case UFS_FSSTABLE:
			UFSD("fs is stable\n");
			break;
		case UFS_FSOSF1:
			UFSD("fs is DEC OSF/1\n");
			break;
		case UFS_FSACTIVE:
			printk("ufs_read_super: fs is active\n");
			sb->s_flags |= MS_RDONLY;
			break;
		case UFS_FSBAD:
			printk("ufs_read_super: fs is bad\n");
			sb->s_flags |= MS_RDONLY;
			break;
		default:
			printk("ufs_read_super: can't grok fs_clean 0x%x\n", usb1->fs_clean);
			sb->s_flags |= MS_RDONLY;
			break;
		}
	} else {
		printk("ufs_read_super: fs needs fsck\n");
		sb->s_flags |= MS_RDONLY;
	}

	/*
	 * Read ufs_super_block into internal data structures
	 */
	sb->s_op = &ufs_super_ops;
	sb->dq_op = NULL; /***/
	sb->s_magic = fs32_to_cpu(sb, usb3->fs_magic);

	uspi->s_sblkno = fs32_to_cpu(sb, usb1->fs_sblkno);