Exemplo n.º 1
0
static int bfs_fill_super(struct super_block *s, void *data, int silent)
{
	struct buffer_head *bh, *sbh;
	struct bfs_super_block *bfs_sb;
	struct inode *inode;
	unsigned i, imap_len;
	struct bfs_sb_info *info;
	int ret = -EINVAL;
	unsigned long i_sblock, i_eblock, i_eoff, s_size;

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;
	mutex_init(&info->bfs_lock);
	s->s_fs_info = info;

	sb_set_blocksize(s, BFS_BSIZE);

	sbh = sb_bread(s, 0);
	if (!sbh)
		goto out;
	bfs_sb = (struct bfs_super_block *)sbh->b_data;
	if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
		if (!silent)
			printf("No BFS filesystem on %s (magic=%08x)\n", 
				s->s_id,  le32_to_cpu(bfs_sb->s_magic));
		goto out1;
	}
	if (BFS_UNCLEAN(bfs_sb, s) && !silent)
		printf("%s is unclean, continuing\n", s->s_id);

	s->s_magic = BFS_MAGIC;

	if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) {
		printf("Superblock is corrupted\n");
		goto out1;
	}

	info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
					sizeof(struct bfs_inode)
					+ BFS_ROOT_INO - 1;
	imap_len = (info->si_lasti / 8) + 1;
	info->si_imap = kzalloc(imap_len, GFP_KERNEL);
	if (!info->si_imap)
		goto out1;
	for (i = 0; i < BFS_ROOT_INO; i++)
		set_bit(i, info->si_imap);

	s->s_op = &bfs_sops;
	inode = bfs_iget(s, BFS_ROOT_INO);
	if (IS_ERR(inode)) {
		ret = PTR_ERR(inode);
		goto out2;
	}
	s->s_root = d_alloc_root(inode);
	if (!s->s_root) {
		iput(inode);
		ret = -ENOMEM;
		goto out2;
	}

	info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
	info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
			- le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
	info->si_freei = 0;
	info->si_lf_eblk = 0;

	/* can we read the last block? */
	bh = sb_bread(s, info->si_blocks - 1);
	if (!bh) {
		printf("Last block not available: %lu\n", info->si_blocks - 1);
		ret = -EIO;
		goto out3;
	}
	brelse(bh);

	bh = NULL;
	for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
		struct bfs_inode *di;
		int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
		int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
		unsigned long eblock;

		if (!off) {
			brelse(bh);
			bh = sb_bread(s, block);
		}

		if (!bh)
			continue;

		di = (struct bfs_inode *)bh->b_data + off;

		/* test if filesystem is not corrupted */

		i_eoff = le32_to_cpu(di->i_eoffset);
		i_sblock = le32_to_cpu(di->i_sblock);
		i_eblock = le32_to_cpu(di->i_eblock);
		s_size = le32_to_cpu(bfs_sb->s_end);

		if (i_sblock > info->si_blocks ||
			i_eblock > info->si_blocks ||
			i_sblock > i_eblock ||
			i_eoff > s_size ||
			i_sblock * BFS_BSIZE > i_eoff) {

			printf("Inode 0x%08x corrupted\n", i);

			brelse(bh);
			ret = -EIO;
			goto out3;
		}

		if (!di->i_ino) {
			info->si_freei++;
			continue;
		}
		set_bit(i, info->si_imap);
		info->si_freeb -= BFS_FILEBLOCKS(di);

		eblock =  le32_to_cpu(di->i_eblock);
		if (eblock > info->si_lf_eblk)
			info->si_lf_eblk = eblock;
	}
	brelse(bh);
	brelse(sbh);
	dump_imap("read_super", s);
	return 0;

out3:
	dput(s->s_root);
	s->s_root = NULL;
out2:
	kfree(info->si_imap);
out1:
	brelse(sbh);
out:
	mutex_destroy(&info->bfs_lock);
	kfree(info);
	s->s_fs_info = NULL;
	return ret;
}
Exemplo n.º 2
0
static int bfs_fill_super(struct super_block *s, void *data, int silent)
{
    struct buffer_head *bh;
    struct bfs_super_block *bfs_sb;
    struct inode *inode;
    unsigned i, imap_len;
    struct bfs_sb_info *info;
    long ret = -EINVAL;

    info = kzalloc(sizeof(*info), GFP_KERNEL);
    if (!info)
        return -ENOMEM;
    s->s_fs_info = info;

    sb_set_blocksize(s, BFS_BSIZE);

    bh = sb_bread(s, 0);
    if(!bh)
        goto out;
    bfs_sb = (struct bfs_super_block *)bh->b_data;
    if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
        if (!silent)
            printf("No BFS filesystem on %s (magic=%08x)\n",
                   s->s_id,  le32_to_cpu(bfs_sb->s_magic));
        goto out;
    }
    if (BFS_UNCLEAN(bfs_sb, s) && !silent)
        printf("%s is unclean, continuing\n", s->s_id);

    s->s_magic = BFS_MAGIC;
    info->si_sbh = bh;
    info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
                     sizeof(struct bfs_inode)
                     + BFS_ROOT_INO - 1;
    imap_len = (info->si_lasti / 8) + 1;
    info->si_imap = kzalloc(imap_len, GFP_KERNEL);
    if (!info->si_imap)
        goto out;
    for (i = 0; i < BFS_ROOT_INO; i++)
        set_bit(i, info->si_imap);

    s->s_op = &bfs_sops;
    inode = bfs_iget(s, BFS_ROOT_INO);
    if (IS_ERR(inode)) {
        ret = PTR_ERR(inode);
        kfree(info->si_imap);
        goto out;
    }
    s->s_root = d_alloc_root(inode);
    if (!s->s_root) {
        iput(inode);
        ret = -ENOMEM;
        kfree(info->si_imap);
        goto out;
    }

    info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
    info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
                      - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
    info->si_freei = 0;
    info->si_lf_eblk = 0;
    bh = NULL;
    for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
        struct bfs_inode *di;
        int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
        int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
        unsigned long sblock, eblock;

        if (!off) {
            brelse(bh);
            bh = sb_bread(s, block);
        }

        if (!bh)
            continue;

        di = (struct bfs_inode *)bh->b_data + off;

        if (!di->i_ino) {
            info->si_freei++;
            continue;
        }
        set_bit(i, info->si_imap);
        info->si_freeb -= BFS_FILEBLOCKS(di);

        sblock =  le32_to_cpu(di->i_sblock);
        eblock =  le32_to_cpu(di->i_eblock);
        if (eblock > info->si_lf_eblk)
            info->si_lf_eblk = eblock;
    }
    brelse(bh);
    if (!(s->s_flags & MS_RDONLY)) {
        mark_buffer_dirty(info->si_sbh);
        s->s_dirt = 1;
    }
    dump_imap("read_super", s);
    return 0;

out:
    brelse(bh);
    kfree(info);
    s->s_fs_info = NULL;
    return ret;
}