Example #1
0
/**
 * nilfs_palloc_init_blockgroup - initialize private variables for allocator
 * @inode: inode of metadata file using this allocator
 * @entry_size: size of the persistent object
 */
int nilfs_palloc_init_blockgroup(struct inode *inode, unsigned int entry_size)
{
	struct nilfs_mdt_info *mi = NILFS_MDT(inode);

	mi->mi_bgl = kmalloc(sizeof(*mi->mi_bgl), GFP_NOFS);
	if (!mi->mi_bgl)
		return -ENOMEM;

	bgl_lock_init(mi->mi_bgl);

	nilfs_mdt_set_entry_size(inode, entry_size, 0);

	mi->mi_blocks_per_group =
		DIV_ROUND_UP(nilfs_palloc_entries_per_group(inode),
			     mi->mi_entries_per_block) + 1;
		/*
		 * Number of blocks in a group including entry blocks
		 * and a bitmap block
		 */
	mi->mi_blocks_per_desc_block =
		nilfs_palloc_groups_per_desc_block(inode) *
		mi->mi_blocks_per_group + 1;
		/*
		 * Number of blocks per descriptor including the
		 * descriptor block
		 */
	return 0;
}
Example #2
0
static int ext2_fill_super(struct super_block *sb, void *data, int silent)
{
	struct buffer_head * bh;
	struct ext2_sb_info * sbi;
	struct ext2_super_block * es;
	struct inode *root;
	unsigned long block;
	unsigned long sb_block = get_sb_block(&data);
	unsigned long logic_sb_block;
	unsigned long offset = 0;
	unsigned long def_mount_opts;
	long ret = -EINVAL;
	int blocksize = BLOCK_SIZE;
	int db_count;
	int i, j;
	__le32 features;
	int err;

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;

	sbi->s_blockgroup_lock =
		kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
	if (!sbi->s_blockgroup_lock) {
		kfree(sbi);
		return -ENOMEM;
	}
	sb->s_fs_info = sbi;
	sbi->s_sb_block = sb_block;

	/*
	 * See what the current blocksize for the device is, and
	 * use that as the blocksize.  Otherwise (or if the blocksize
	 * is smaller than the default) use the default.
	 * This is important for devices that have a hardware
	 * sectorsize that is larger than the default.
	 */
	blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
	if (!blocksize) {
		printk ("EXT2-fs: unable to set blocksize\n");
		goto failed_sbi;
	}

	/*
	 * If the superblock doesn't start on a hardware sector boundary,
	 * calculate the offset.  
	 */
	if (blocksize != BLOCK_SIZE) {
		logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
		offset = (sb_block*BLOCK_SIZE) % blocksize;
	} else {
		logic_sb_block = sb_block;
	}

	if (!(bh = sb_bread(sb, logic_sb_block))) {
		printk ("EXT2-fs: unable to read superblock\n");
		goto failed_sbi;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
	 *       some ext2 macro-instructions depend on its value
	 */
	es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);

	if (sb->s_magic != EXT2_SUPER_MAGIC)
		goto cantfind_ext2;

	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
	if (def_mount_opts & EXT2_DEFM_DEBUG)
		set_opt(sbi->s_mount_opt, DEBUG);
	if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
		set_opt(sbi->s_mount_opt, GRPID);
	if (def_mount_opts & EXT2_DEFM_UID16)
		set_opt(sbi->s_mount_opt, NO_UID32);
#ifdef CONFIG_EXT2_FS_XATTR
	if (def_mount_opts & EXT2_DEFM_XATTR_USER)
		set_opt(sbi->s_mount_opt, XATTR_USER);
#endif
#ifdef CONFIG_EXT2_FS_POSIX_ACL
	if (def_mount_opts & EXT2_DEFM_ACL)
		set_opt(sbi->s_mount_opt, POSIX_ACL);
#endif
	
	if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
		set_opt(sbi->s_mount_opt, ERRORS_PANIC);
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
		set_opt(sbi->s_mount_opt, ERRORS_CONT);
	else
		set_opt(sbi->s_mount_opt, ERRORS_RO);

	sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
	sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
	
	set_opt(sbi->s_mount_opt, RESERVATION);

	if (!parse_options ((char *) data, sbi))
		goto failed_mount;

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
		((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
		 MS_POSIXACL : 0);

	ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
				    EXT2_MOUNT_XIP if not */

	if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
	    (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
	     EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
	     EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
		printk("EXT2-fs warning: feature flags set on rev 0 fs, "
		       "running e2fsck is recommended\n");
	/*
	 * Check feature flags regardless of the revision level, since we
	 * previously didn't change the revision level when setting the flags,
	 * so there is a chance incompat flags are set on a rev 0 filesystem.
	 */
	features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
	if (features) {
		printk("EXT2-fs: %s: couldn't mount because of "
		       "unsupported optional features (%x).\n",
		       sb->s_id, le32_to_cpu(features));
		goto failed_mount;
	}
	if (!(sb->s_flags & MS_RDONLY) &&
	    (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
		printk("EXT2-fs: %s: couldn't mount RDWR because of "
		       "unsupported optional features (%x).\n",
		       sb->s_id, le32_to_cpu(features));
		goto failed_mount;
	}

	blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);

	if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) {
		if (!silent)
			printk("XIP: Unsupported blocksize\n");
		goto failed_mount;
	}

	/* If the blocksize doesn't match, re-read the thing.. */
	if (sb->s_blocksize != blocksize) {
		brelse(bh);

		if (!sb_set_blocksize(sb, blocksize)) {
			printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n");
			goto failed_sbi;
		}

		logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
		offset = (sb_block*BLOCK_SIZE) % blocksize;
		bh = sb_bread(sb, logic_sb_block);
		if(!bh) {
			printk("EXT2-fs: Couldn't read superblock on "
			       "2nd try.\n");
			goto failed_sbi;
		}
		es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
		sbi->s_es = es;
		if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
			printk ("EXT2-fs: Magic mismatch, very weird !\n");
			goto failed_mount;
		}
	}

	sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);

	if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
		sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
		sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
		if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
		    !is_power_of_2(sbi->s_inode_size) ||
		    (sbi->s_inode_size > blocksize)) {
			printk ("EXT2-fs: unsupported inode size: %d\n",
				sbi->s_inode_size);
			goto failed_mount;
		}
	}

	sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
				   le32_to_cpu(es->s_log_frag_size);
	if (sbi->s_frag_size == 0)
		goto cantfind_ext2;
	sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;

	sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
	sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
	sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);

	if (EXT2_INODE_SIZE(sb) == 0)
		goto cantfind_ext2;
	sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
	if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
		goto cantfind_ext2;
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
	sbi->s_desc_per_block = sb->s_blocksize /
					sizeof (struct ext2_group_desc);
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
	sbi->s_addr_per_block_bits =
		ilog2 (EXT2_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits =
		ilog2 (EXT2_DESC_PER_BLOCK(sb));

	if (sb->s_magic != EXT2_SUPER_MAGIC)
		goto cantfind_ext2;

	if (sb->s_blocksize != bh->b_size) {
		if (!silent)
			printk ("VFS: Unsupported blocksize on dev "
				"%s.\n", sb->s_id);
		goto failed_mount;
	}

	if (sb->s_blocksize != sbi->s_frag_size) {
		printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
			sbi->s_frag_size, sb->s_blocksize);
		goto failed_mount;
	}

	if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
		printk ("EXT2-fs: #blocks per group too big: %lu\n",
			sbi->s_blocks_per_group);
		goto failed_mount;
	}
	if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
		printk ("EXT2-fs: #fragments per group too big: %lu\n",
			sbi->s_frags_per_group);
		goto failed_mount;
	}
	if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
		printk ("EXT2-fs: #inodes per group too big: %lu\n",
			sbi->s_inodes_per_group);
		goto failed_mount;
	}

	if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext2;
 	sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
 				le32_to_cpu(es->s_first_data_block) - 1)
 					/ EXT2_BLOCKS_PER_GROUP(sb)) + 1;
	db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
		   EXT2_DESC_PER_BLOCK(sb);
	sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
	if (sbi->s_group_desc == NULL) {
		printk ("EXT2-fs: not enough memory\n");
		goto failed_mount;
	}
	bgl_lock_init(sbi->s_blockgroup_lock);
	sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
	if (!sbi->s_debts) {
		printk ("EXT2-fs: not enough memory\n");
		goto failed_mount_group_desc;
	}
	for (i = 0; i < db_count; i++) {
		block = descriptor_loc(sb, logic_sb_block, i);
		sbi->s_group_desc[i] = sb_bread(sb, block);
		if (!sbi->s_group_desc[i]) {
			for (j = 0; j < i; j++)
				brelse (sbi->s_group_desc[j]);
			printk ("EXT2-fs: unable to read group descriptors\n");
			goto failed_mount_group_desc;
		}
	}
	if (!ext2_check_descriptors (sb)) {
		printk ("EXT2-fs: group descriptors corrupted!\n");
		goto failed_mount2;
	}
	sbi->s_gdb_count = db_count;
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);

	/* per fileystem reservation list head & lock */
	spin_lock_init(&sbi->s_rsv_window_lock);
	sbi->s_rsv_window_root = RB_ROOT;
	/*
	 * Add a single, static dummy reservation to the start of the
	 * reservation window list --- it gives us a placeholder for
	 * append-at-start-of-list which makes the allocation logic
	 * _much_ simpler.
	 */
	sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
	sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
	sbi->s_rsv_window_head.rsv_alloc_hit = 0;
	sbi->s_rsv_window_head.rsv_goal_size = 0;
	ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);

	err = percpu_counter_init(&sbi->s_freeblocks_counter,
				ext2_count_free_blocks(sb));
	if (!err) {
		err = percpu_counter_init(&sbi->s_freeinodes_counter,
				ext2_count_free_inodes(sb));
	}
	if (!err) {
		err = percpu_counter_init(&sbi->s_dirs_counter,
				ext2_count_dirs(sb));
	}
	if (err) {
		printk(KERN_ERR "EXT2-fs: insufficient memory\n");
		goto failed_mount3;
	}
	/*
	 * set up enough so that it can read an inode
	 */
	sb->s_op = &ext2_sops;
	sb->s_export_op = &ext2_export_ops;
	sb->s_xattr = ext2_xattr_handlers;
	root = ext2_iget(sb, EXT2_ROOT_INO);
	if (IS_ERR(root)) {
		ret = PTR_ERR(root);
		goto failed_mount3;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
		iput(root);
		printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n");
		goto failed_mount3;
	}

	sb->s_root = d_alloc_root(root);
	if (!sb->s_root) {
		iput(root);
		printk(KERN_ERR "EXT2-fs: get root inode failed\n");
		ret = -ENOMEM;
		goto failed_mount3;
	}
	if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
		ext2_warning(sb, __func__,
			"mounting ext3 filesystem as ext2");
	ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY);
	return 0;

cantfind_ext2:
	if (!silent)
		printk("VFS: Can't find an ext2 filesystem on dev %s.\n",
		       sb->s_id);
	goto failed_mount;
failed_mount3:
	percpu_counter_destroy(&sbi->s_freeblocks_counter);
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
failed_mount_group_desc:
	kfree(sbi->s_group_desc);
	kfree(sbi->s_debts);
failed_mount:
	brelse(bh);
failed_sbi:
	sb->s_fs_info = NULL;
	kfree(sbi->s_blockgroup_lock);
	kfree(sbi);
	return ret;
}
/*
==================================================================================
	Function	:me2fsFillSuperBlock
	Input		:struct super_block *sb
				 < vfs super block object >
				 void *data
				 < user data >
				 int silent
				 < silent flag >
	Output		:void
	Return		:void

	Description	:fill my ext2 super block object
==================================================================================
*/
static int me2fsFillSuperBlock( struct super_block *sb,
								void *data,
								int silent )
{
	struct buffer_head		*bh;
	struct ext2_super_block	*esb;
	struct me2fs_sb_info	*msi;
	struct inode			*root;
	int						block_size;
	int						ret = -EINVAL;
	int						i;
	int						err;
	unsigned long			sb_block = 1;

	/* ------------------------------------------------------------------------ */
	/* allocate memory to me2fs_sb_info											*/
	/* ------------------------------------------------------------------------ */
	msi = kzalloc( sizeof( struct me2fs_sb_info ), GFP_KERNEL );

	if( !msi )
	{
		ME2FS_ERROR( "<ME2FS>error: unable to alloc me2fs_sb_info\n" );
		ret = -ENOMEM;
		return( ret );
	}

	/* set me2fs information to vfs super block									*/
	sb->s_fs_info	= ( void* )msi;

	/* ------------------------------------------------------------------------ */
	/* allocate memory to spin locks for block group							*/
	/* ------------------------------------------------------------------------ */
	msi->s_blockgroup_lock = kzalloc( sizeof( struct blockgroup_lock ),
									  GFP_KERNEL );
	if( !msi->s_blockgroup_lock )
	{
		ME2FS_ERROR( "<ME2FS>error: unabel to alloc s_blockgroup_lock\n" );
		kfree( msi );
		return( -ENOMEM );
	}

	/* ------------------------------------------------------------------------ */
	/* set device's block size and size bits to super block						*/
	/* ------------------------------------------------------------------------ */
	block_size = sb_min_blocksize( sb, BLOCK_SIZE );

	DBGPRINT( "<ME2FS>Fill Super! block_size = %d\n", block_size );
	DBGPRINT( "<ME2FS>s_blocksize_bits = %d\n", sb->s_blocksize_bits );
	DBGPRINT( "<ME2FS>default block size is : %d\n", BLOCK_SIZE );

	if( !block_size )
	{
		ME2FS_ERROR( "<ME2FS>error: unable to set blocksize\n" );
		goto error_read_sb;
	}

	/* ------------------------------------------------------------------------ */
	/* read super block															*/
	/* ------------------------------------------------------------------------ */
	if( !( bh = sb_bread( sb, sb_block ) ) )
	{
		ME2FS_ERROR( "<ME2FS>failed to bread super block\n" );
		goto error_read_sb;
	}

	esb = ( struct ext2_super_block* )( bh->b_data );

	/* ------------------------------------------------------------------------ */
	/* check magic number														*/
	/* ------------------------------------------------------------------------ */
	sb->s_magic = le16_to_cpu( esb->s_magic );

	if( sb->s_magic != ME2FS_SUPER_MAGIC )
	{
		ME2FS_ERROR( "<ME2FS>error : magic of super block is %lu\n", sb->s_magic );
		goto error_mount;
	}

	/* ------------------------------------------------------------------------ */
	/* check revison															*/
	/* ------------------------------------------------------------------------ */
	if( ME2FS_OLD_REV == le32_to_cpu( esb->s_rev_level ) )
	{
		ME2FS_ERROR( "<ME2FS>error : cannot mount old revision\n" );
		goto error_mount;
	}

	dbgPrintExt2SB( esb );

	/* ------------------------------------------------------------------------ */
	/* set up me2fs super block information										*/
	/* ------------------------------------------------------------------------ */
	/* buffer cache information													*/
	msi->s_esb				= esb;
	msi->s_sbh				= bh;
	/* super block(disk information cache)										*/
	msi->s_sb_block			= sb_block;
	msi->s_mount_opt		= le32_to_cpu( esb->s_default_mount_opts );
	msi->s_mount_state		= le16_to_cpu( esb->s_state );

	if( msi->s_mount_state != EXT2_VALID_FS )
	{
		ME2FS_ERROR( "<ME2FS>error : cannot mount invalid fs\n" );
		goto error_mount;
	}

	if( le16_to_cpu( esb->s_errors ) == EXT2_ERRORS_CONTINUE )
	{
		DBGPRINT( "<ME2FS>s_errors : CONTINUE\n" );
	}
	else if( le16_to_cpu( esb->s_errors ) == EXT2_ERRORS_PANIC )
	{
		DBGPRINT( "<ME2FS>s_errors : PANIC\n" );
	}
	else
	{
		DBGPRINT( "<ME2FS>s_errors : READ ONLY\n" );
	}

	if( le32_to_cpu( esb->s_rev_level ) != EXT2_DYNAMIC_REV )
	{
		ME2FS_ERROR( "<ME2FS>error : cannot mount unsupported revision\n" );
		goto error_mount;
	}

	/* inode(disk information cache)											*/
	msi->s_inode_size		= le16_to_cpu( esb->s_inode_size );
	if( ( msi->s_inode_size < 128  ) ||
		!is_power_of_2( msi->s_inode_size ) ||
		( block_size < msi->s_inode_size ) )
	{
		ME2FS_ERROR( "<ME2FS>error : cannot mount unsupported inode size %u\n",
				  msi->s_inode_size );
		goto error_mount;
	}
	msi->s_first_ino		= le32_to_cpu( esb->s_first_ino );
	msi->s_inodes_per_group	= le32_to_cpu( esb->s_inodes_per_group );
	msi->s_inodes_per_block	= sb->s_blocksize / msi->s_inode_size;
	if( msi->s_inodes_per_block == 0 )
	{
		ME2FS_ERROR( "<ME2FS>error : bad inodes per block\n" );
		goto error_mount;
	}
	msi->s_itb_per_group	= msi->s_inodes_per_group / msi->s_inodes_per_block;
	/* group(disk information cache)											*/
	msi->s_blocks_per_group	= le32_to_cpu( esb->s_blocks_per_group );
	if( msi->s_blocks_per_group == 0 )
	{
		ME2FS_ERROR( "<ME2FS>eroor : bad blocks per group\n" );
		goto error_mount;
	}
	msi->s_groups_count		= ( ( le32_to_cpu( esb->s_blocks_count )
								- le32_to_cpu( esb->s_first_data_block ) - 1 )
							  / msi->s_blocks_per_group ) + 1;
	msi->s_desc_per_block	= sb->s_blocksize / sizeof( struct ext2_group_desc );
	msi->s_gdb_count		= ( msi->s_groups_count + msi->s_desc_per_block - 1 )
							  / msi->s_desc_per_block;
	/* fragment(disk information cache)											*/
	msi->s_frag_size		= 1024 << le32_to_cpu( esb->s_log_frag_size );
	if( msi->s_frag_size == 0 )
	{
		ME2FS_ERROR( "<ME2FS>eroor : bad fragment size\n" );
		goto error_mount;
	}
	msi->s_frags_per_block	= sb->s_blocksize / msi->s_frag_size;
	msi->s_frags_per_group	= le32_to_cpu( esb->s_frags_per_group );

	/* deaults(disk information cache)											*/
	msi->s_resuid = make_kuid( &init_user_ns, le16_to_cpu( esb->s_def_resuid ) );
	msi->s_resgid = make_kgid( &init_user_ns, le16_to_cpu( esb->s_def_resgid ) );
	
	dbgPrintMe2fsInfo( msi );
	
	/* ------------------------------------------------------------------------ */
	/* read block group descriptor table										*/
	/* ------------------------------------------------------------------------ */
	msi->s_group_desc = kmalloc( msi->s_gdb_count * sizeof( struct buffer_head* ),
								 GFP_KERNEL );
	
	if( !msi->s_group_desc )
	{
		ME2FS_ERROR( "<ME2FS>error : alloc memory for group desc is failed\n" );
		goto error_mount;
	}

	for( i = 0 ; i < msi->s_gdb_count ; i++ )
	{
		unsigned long	block;

		block = getDescriptorLocation( sb, sb_block, i );
		if( !( msi->s_group_desc[ i ] = sb_bread( sb, block ) ) )
		//if( !( msi->s_group_desc[ i ] = sb_bread( sb, sb_block + i + 1 ) ) )
		{
			ME2FS_ERROR( "<ME2FS>error : cannot read " );
			ME2FS_ERROR( "block group descriptor[ group=%d ]\n", i );
			goto error_mount_phase2;
		}
	}

	/* ------------------------------------------------------------------------ */
	/* sanity check for group descriptors										*/
	/* ------------------------------------------------------------------------ */
	for( i = 0 ; i < msi->s_groups_count ; i++ )
	{
		struct ext2_group_desc	*gdesc;
		unsigned long			first_block;
		unsigned long			last_block;
		unsigned long			ar_block;

		DBGPRINT( "<ME2FS>Block Count %d\n", i );

		if( !( gdesc = me2fsGetGroupDescriptor( sb, i ) ) )
		{
			/* corresponding group descriptor does not exist					*/
			goto error_mount_phase2;
		}

		first_block	= ext2GetFirstBlockNum( sb, i );

		if( i == ( msi->s_groups_count - 1 ) )
		{
			last_block	= le32_to_cpu( esb->s_blocks_count ) - 1;
		}
		else
		{
			last_block	= first_block + ( esb->s_blocks_per_group - 1 );
		}

		DBGPRINT( "<ME2FS>first = %lu, last = %lu\n", first_block, last_block );

		ar_block = le32_to_cpu( gdesc->bg_block_bitmap );

		if( ( ar_block < first_block ) || ( last_block < ar_block ) )
		{
			ME2FS_ERROR( "<ME2FS>error : block num of block bitmap is " );
			ME2FS_ERROR( "insanity [ group=%d, first=%lu, block=%lu, last=%lu ]\n",
					  i, first_block, ar_block, last_block );
			goto error_mount_phase2;
		}

		ar_block = le32_to_cpu( gdesc->bg_inode_bitmap );

		if( ( ar_block < first_block ) || ( last_block < ar_block ) )
		{
			ME2FS_ERROR( "<ME2FS>error : block num of inode bitmap is " );
			ME2FS_ERROR( "insanity [ group=%d, first=%lu, block=%lu, last=%lu ]\n",
					  i, first_block, ar_block, last_block );
			goto error_mount_phase2;
		}

		ar_block = le32_to_cpu( gdesc->bg_inode_table );

		if( ( ar_block < first_block ) || ( last_block < ar_block ) )
		{
			ME2FS_ERROR( "<ME2FS>error : block num of inode table is " );
			ME2FS_ERROR( "insanity [ group=%d, first=%lu, block=%lu, last=%lu ]\n",
					  i, first_block, ar_block, last_block );
			goto error_mount_phase2;
		}

		dbgPrintExt2Bgd( gdesc, i );
	}

	/* ------------------------------------------------------------------------ */
	/* initialize exclusive locks												*/
	/* ------------------------------------------------------------------------ */
	spin_lock_init( &msi->s_lock );

	bgl_lock_init( msi->s_blockgroup_lock );

	err = percpu_counter_init( &msi->s_freeblocks_counter,
							   me2fsCountFreeBlocks( sb ) );
	
	if( err )
	{
		ME2FS_ERROR( "<ME2FS>cannot allocate memory for percpu counter" );
		ME2FS_ERROR( "[s_freeblocks_counter]\n" );
		goto error_mount_phase3;
	}

	err = percpu_counter_init( &msi->s_freeinodes_counter,
							   me2fsCountFreeInodes( sb ) );
	
	if( err )
	{
		ME2FS_ERROR( "<ME2FS>cannot allocate memory for percpu counter" );
		ME2FS_ERROR( "[s_freeinodes_counter]\n" );
		goto error_mount_phase3;
	}

	err = percpu_counter_init( &msi->s_dirs_counter,
							   me2fsCountDirectories( sb ) );
	
	if( err )
	{
		ME2FS_ERROR( "<ME2FS>cannot allocate memory for percpu counter" );
		ME2FS_ERROR( "[s_dirs_counter]\n" );
		goto error_mount_phase3;
	}

	/* ------------------------------------------------------------------------ */
	/* set up vfs super block													*/
	/* ------------------------------------------------------------------------ */
	sb->s_op		= &me2fs_super_ops;
	//sb->s_export_op	= &me2fs_export_ops;
	//sb->s_xattr		= me2fs_xattr_handler;

	sb->s_maxbytes	= me2fsMaxFileSize( sb );
	sb->s_max_links	= ME2FS_LINK_MAX;

	DBGPRINT( "<ME2FS>max file size = %lld\n", sb->s_maxbytes );


	root = me2fsGetVfsInode( sb, ME2FS_EXT2_ROOT_INO );
	//root = iget_locked( sb, ME2FS_EXT2_ROOT_INO );

	if( IS_ERR( root ) )
	{
		ME2FS_ERROR( "<ME2FS>error : failed to get root inode\n" );
		ret = PTR_ERR( root );
		goto error_mount_phase3;
	}


	if( !S_ISDIR( root->i_mode ) )
	{
		ME2FS_ERROR( "<ME2FS>root is not directory!!!!\n" );
	}

	sb->s_root = d_make_root( root );
	//sb->s_root = d_alloc_root( root_ino );

	if( !sb->s_root )
	{
		ME2FS_ERROR( "<ME2FS>error : failed to make root\n" );
		ret = -ENOMEM;
		goto error_mount_phase3;
	}

	le16_add_cpu( &esb->s_mnt_count, 1 );

	me2fsWriteSuper( sb );

	DBGPRINT( "<ME2FS> me2fs is mounted !\n" );

	return( 0 );

	/* ------------------------------------------------------------------------ */
	/* destroy percpu counter													*/
	/* ------------------------------------------------------------------------ */
error_mount_phase3:
	percpu_counter_destroy( &msi->s_freeblocks_counter );
	percpu_counter_destroy( &msi->s_freeinodes_counter );
	percpu_counter_destroy( &msi->s_dirs_counter );
	/* ------------------------------------------------------------------------ */
	/* release buffer for group descriptors										*/
	/* ------------------------------------------------------------------------ */
error_mount_phase2:
	for( i = 0 ; i < msi->s_gdb_count ; i++ )
	{
		brelse( msi->s_group_desc[ i ] );
	}
	kfree( msi->s_group_desc );
	/* ------------------------------------------------------------------------ */
	/* release buffer cache for read super block								*/
	/* ------------------------------------------------------------------------ */
error_mount:
	brelse( bh );

	/* ------------------------------------------------------------------------ */
	/* release me2fs super block information									*/
	/* ------------------------------------------------------------------------ */
error_read_sb:
	sb->s_fs_info = NULL;
	kfree( msi->s_blockgroup_lock );
	kfree( msi );

	return( ret );
}
Example #4
0
static int ext2_fill_super(struct super_block *sb, void *data, int silent)
{
	struct buffer_head * bh;
	struct ext2_sb_info * sbi;
	struct ext2_super_block * es;
	struct inode *root;
	unsigned long block;
	unsigned long sb_block = get_sb_block(&data);
	unsigned long logic_sb_block;
	unsigned long offset = 0;
	unsigned long def_mount_opts;
	long ret = -EINVAL;
	int blocksize = BLOCK_SIZE;
	int db_count;
	int i, j;
	__le32 features;
	int err;

	err = -ENOMEM;
	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
		goto failed;

	sbi->s_blockgroup_lock =
		kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
	if (!sbi->s_blockgroup_lock) {
		kfree(sbi);
		goto failed;
	}
	sb->s_fs_info = sbi;
	sbi->s_sb_block = sb_block;

	spin_lock_init(&sbi->s_lock);

	/*
	 * See what the current blocksize for the device is, and
	 * use that as the blocksize.  Otherwise (or if the blocksize
	 * is smaller than the default) use the default.
	 * This is important for devices that have a hardware
	 * sectorsize that is larger than the default.
	 */
	blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
	if (!blocksize) {
		ext2_msg(sb, KERN_ERR, "error: unable to set blocksize");
		goto failed_sbi;
	}

	/*
	 * If the superblock doesn't start on a hardware sector boundary,
	 * calculate the offset.  
	 */
	if (blocksize != BLOCK_SIZE) {
		logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
		offset = (sb_block*BLOCK_SIZE) % blocksize;
	} else {
		logic_sb_block = sb_block;
	}

	if (!(bh = sb_bread(sb, logic_sb_block))) {
		ext2_msg(sb, KERN_ERR, "error: unable to read superblock");
		goto failed_sbi;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
	 *       some ext2 macro-instructions depend on its value
	 */
	es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);

	if (sb->s_magic != EXT2_SUPER_MAGIC)
		goto cantfind_ext2;

	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
	if (def_mount_opts & EXT2_DEFM_DEBUG)
		set_opt(sbi->s_mount_opt, DEBUG);
	if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
		set_opt(sbi->s_mount_opt, GRPID);
	if (def_mount_opts & EXT2_DEFM_UID16)
		set_opt(sbi->s_mount_opt, NO_UID32);
#ifdef CONFIG_EXT2_FS_XATTR
	if (def_mount_opts & EXT2_DEFM_XATTR_USER)
		set_opt(sbi->s_mount_opt, XATTR_USER);
#endif
#ifdef CONFIG_EXT2_FS_POSIX_ACL
	if (def_mount_opts & EXT2_DEFM_ACL)
		set_opt(sbi->s_mount_opt, POSIX_ACL);
#endif
	
	if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
		set_opt(sbi->s_mount_opt, ERRORS_PANIC);
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
		set_opt(sbi->s_mount_opt, ERRORS_CONT);
	else
		set_opt(sbi->s_mount_opt, ERRORS_RO);

	sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
	sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
	
	set_opt(sbi->s_mount_opt, RESERVATION);

	if (!parse_options((char *) data, sb))
		goto failed_mount;

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
		((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
		 MS_POSIXACL : 0);
	sb->s_iflags |= SB_I_CGROUPWB;

	if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
	    (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
	     EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
	     EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
		ext2_msg(sb, KERN_WARNING,
			"warning: feature flags set on rev 0 fs, "
			"running e2fsck is recommended");
	/*
	 * Check feature flags regardless of the revision level, since we
	 * previously didn't change the revision level when setting the flags,
	 * so there is a chance incompat flags are set on a rev 0 filesystem.
	 */
	features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
	if (features) {
		ext2_msg(sb, KERN_ERR,	"error: couldn't mount because of "
		       "unsupported optional features (%x)",
			le32_to_cpu(features));
		goto failed_mount;
	}
	if (!(sb->s_flags & MS_RDONLY) &&
	    (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
		ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of "
		       "unsupported optional features (%x)",
		       le32_to_cpu(features));
		goto failed_mount;
	}

	blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);

	if (sbi->s_mount_opt & EXT2_MOUNT_DAX) {
		struct blk_dax_ctl dax = {
			.sector = 0,
			.size = PAGE_SIZE,
		};
		if (blocksize != PAGE_SIZE) {
			ext2_msg(sb, KERN_ERR,
					"error: unsupported blocksize for dax");
			goto failed_mount;
		}
		err = bdev_direct_access(sb->s_bdev, &dax);
		if (err < 0) {
			switch (err) {
			case -EOPNOTSUPP:
				ext2_msg(sb, KERN_ERR,
					"error: device does not support dax");
				break;
			case -EINVAL:
				ext2_msg(sb, KERN_ERR,
					"error: unaligned partition for dax");
				break;
			default:
				ext2_msg(sb, KERN_ERR,
					"error: dax access failed (%d)", err);
				break;
			}
			goto failed_mount;
		}
	}

	/* If the blocksize doesn't match, re-read the thing.. */
	if (sb->s_blocksize != blocksize) {
		brelse(bh);

		if (!sb_set_blocksize(sb, blocksize)) {
			ext2_msg(sb, KERN_ERR,
				"error: bad blocksize %d", blocksize);
			goto failed_sbi;
		}

		logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
		offset = (sb_block*BLOCK_SIZE) % blocksize;
		bh = sb_bread(sb, logic_sb_block);
		if(!bh) {
			ext2_msg(sb, KERN_ERR, "error: couldn't read"
				"superblock on 2nd try");
			goto failed_sbi;
		}
		es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
		sbi->s_es = es;
		if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
			ext2_msg(sb, KERN_ERR, "error: magic mismatch");
			goto failed_mount;
		}
	}

	sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
	sb->s_max_links = EXT2_LINK_MAX;

	if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
		sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
		sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
		if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
		    !is_power_of_2(sbi->s_inode_size) ||
		    (sbi->s_inode_size > blocksize)) {
			ext2_msg(sb, KERN_ERR,
				"error: unsupported inode size: %d",
				sbi->s_inode_size);
			goto failed_mount;
		}
	}

	sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
				   le32_to_cpu(es->s_log_frag_size);
	if (sbi->s_frag_size == 0)
		goto cantfind_ext2;
	sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;

	sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
	sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
	sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);

	if (EXT2_INODE_SIZE(sb) == 0)
		goto cantfind_ext2;
	sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
	if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
		goto cantfind_ext2;
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
	sbi->s_desc_per_block = sb->s_blocksize /
					sizeof (struct ext2_group_desc);
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
	sbi->s_addr_per_block_bits =
		ilog2 (EXT2_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits =
		ilog2 (EXT2_DESC_PER_BLOCK(sb));

	if (sb->s_magic != EXT2_SUPER_MAGIC)
		goto cantfind_ext2;

	if (sb->s_blocksize != bh->b_size) {
		if (!silent)
			ext2_msg(sb, KERN_ERR, "error: unsupported blocksize");
		goto failed_mount;
	}

	if (sb->s_blocksize != sbi->s_frag_size) {
		ext2_msg(sb, KERN_ERR,
			"error: fragsize %lu != blocksize %lu"
			"(not supported yet)",
			sbi->s_frag_size, sb->s_blocksize);
		goto failed_mount;
	}

	if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
		ext2_msg(sb, KERN_ERR,
			"error: #blocks per group too big: %lu",
			sbi->s_blocks_per_group);
		goto failed_mount;
	}
	if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
		ext2_msg(sb, KERN_ERR,
			"error: #fragments per group too big: %lu",
			sbi->s_frags_per_group);
		goto failed_mount;
	}
	if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
		ext2_msg(sb, KERN_ERR,
			"error: #inodes per group too big: %lu",
			sbi->s_inodes_per_group);
		goto failed_mount;
	}

	if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext2;
 	sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
 				le32_to_cpu(es->s_first_data_block) - 1)
 					/ EXT2_BLOCKS_PER_GROUP(sb)) + 1;
	db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
		   EXT2_DESC_PER_BLOCK(sb);
	sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
	if (sbi->s_group_desc == NULL) {
		ext2_msg(sb, KERN_ERR, "error: not enough memory");
		goto failed_mount;
	}
	bgl_lock_init(sbi->s_blockgroup_lock);
	sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
	if (!sbi->s_debts) {
		ext2_msg(sb, KERN_ERR, "error: not enough memory");
		goto failed_mount_group_desc;
	}
	for (i = 0; i < db_count; i++) {
		block = descriptor_loc(sb, logic_sb_block, i);
		sbi->s_group_desc[i] = sb_bread(sb, block);
		if (!sbi->s_group_desc[i]) {
			for (j = 0; j < i; j++)
				brelse (sbi->s_group_desc[j]);
			ext2_msg(sb, KERN_ERR,
				"error: unable to read group descriptors");
			goto failed_mount_group_desc;
		}
	}
	if (!ext2_check_descriptors (sb)) {
		ext2_msg(sb, KERN_ERR, "group descriptors corrupted");
		goto failed_mount2;
	}
	sbi->s_gdb_count = db_count;
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);

	/* per fileystem reservation list head & lock */
	spin_lock_init(&sbi->s_rsv_window_lock);
	sbi->s_rsv_window_root = RB_ROOT;
	/*
	 * Add a single, static dummy reservation to the start of the
	 * reservation window list --- it gives us a placeholder for
	 * append-at-start-of-list which makes the allocation logic
	 * _much_ simpler.
	 */
	sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
	sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
	sbi->s_rsv_window_head.rsv_alloc_hit = 0;
	sbi->s_rsv_window_head.rsv_goal_size = 0;
	ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);

	err = percpu_counter_init(&sbi->s_freeblocks_counter,
				ext2_count_free_blocks(sb), GFP_KERNEL);
	if (!err) {
		err = percpu_counter_init(&sbi->s_freeinodes_counter,
				ext2_count_free_inodes(sb), GFP_KERNEL);
	}
	if (!err) {
		err = percpu_counter_init(&sbi->s_dirs_counter,
				ext2_count_dirs(sb), GFP_KERNEL);
	}
	if (err) {
		ext2_msg(sb, KERN_ERR, "error: insufficient memory");
		goto failed_mount3;
	}

#ifdef CONFIG_EXT2_FS_XATTR
	sbi->s_mb_cache = ext2_xattr_create_cache();
	if (!sbi->s_mb_cache) {
		ext2_msg(sb, KERN_ERR, "Failed to create an mb_cache");
		goto failed_mount3;
	}
#endif
	/*
	 * set up enough so that it can read an inode
	 */
	sb->s_op = &ext2_sops;
	sb->s_export_op = &ext2_export_ops;
	sb->s_xattr = ext2_xattr_handlers;

#ifdef CONFIG_QUOTA
	sb->dq_op = &dquot_operations;
	sb->s_qcop = &dquot_quotactl_ops;
	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
#endif

	root = ext2_iget(sb, EXT2_ROOT_INO);
	if (IS_ERR(root)) {
		ret = PTR_ERR(root);
		goto failed_mount3;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
		iput(root);
		ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
		goto failed_mount3;
	}

	sb->s_root = d_make_root(root);
	if (!sb->s_root) {
		ext2_msg(sb, KERN_ERR, "error: get root inode failed");
		ret = -ENOMEM;
		goto failed_mount3;
	}
	if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
		ext2_msg(sb, KERN_WARNING,
			"warning: mounting ext3 filesystem as ext2");
	if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY))
		sb->s_flags |= MS_RDONLY;
	ext2_write_super(sb);
	return 0;

cantfind_ext2:
	if (!silent)
		ext2_msg(sb, KERN_ERR,
			"error: can't find an ext2 filesystem on dev %s.",
			sb->s_id);
	goto failed_mount;
failed_mount3:
	if (sbi->s_mb_cache)
		ext2_xattr_destroy_cache(sbi->s_mb_cache);
	percpu_counter_destroy(&sbi->s_freeblocks_counter);
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
failed_mount_group_desc:
	kfree(sbi->s_group_desc);
	kfree(sbi->s_debts);
failed_mount:
	brelse(bh);
failed_sbi:
	sb->s_fs_info = NULL;
	kfree(sbi->s_blockgroup_lock);
	kfree(sbi);
failed:
	return ret;
}

static void ext2_clear_super_error(struct super_block *sb)
{
	struct buffer_head *sbh = EXT2_SB(sb)->s_sbh;

	if (buffer_write_io_error(sbh)) {
		/*
		 * Oh, dear.  A previous attempt to write the
		 * superblock failed.  This could happen because the
		 * USB device was yanked out.  Or it could happen to
		 * be a transient write error and maybe the block will
		 * be remapped.  Nothing we can do but to retry the
		 * write and hope for the best.
		 */
		ext2_msg(sb, KERN_ERR,
		       "previous I/O error to superblock detected\n");
		clear_buffer_write_io_error(sbh);
		set_buffer_uptodate(sbh);
	}
}

static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
			    int wait)
{
	ext2_clear_super_error(sb);
	spin_lock(&EXT2_SB(sb)->s_lock);
	es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
	es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
	es->s_wtime = cpu_to_le32(get_seconds());
	/* unlock before we do IO */
	spin_unlock(&EXT2_SB(sb)->s_lock);
	mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
	if (wait)
		sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
}