示例#1
0
/* Get the length of the key from a keyed record */
u16 hfs_brec_keylen(struct hfs_bnode *node, u16 rec)
{
	u16 retval, recoff;

	if (node->type != HFS_NODE_INDEX && node->type != HFS_NODE_LEAF)
		return 0;

	if ((node->type == HFS_NODE_INDEX) &&
	   !(node->tree->attributes & HFS_TREE_VARIDXKEYS)) {
		if (node->tree->attributes & HFS_TREE_BIGKEYS)
			retval = node->tree->max_key_len + 2;
		else
			retval = node->tree->max_key_len + 1;
	} else {
		recoff = hfs_bnode_read_u16(node, node->tree->node_size - (rec + 1) * 2);
		if (!recoff)
			return 0;
		if (node->tree->attributes & HFS_TREE_BIGKEYS) {
			retval = hfs_bnode_read_u16(node, recoff) + 2;
			if (retval > node->tree->max_key_len + 2) {
				printk(KERN_ERR "hfs: keylen %d too large\n",
					retval);
				retval = 0;
			}
		} else {
			retval = (hfs_bnode_read_u8(node, recoff) | 1) + 1;
			if (retval > node->tree->max_key_len + 1) {
				printk(KERN_ERR "hfs: keylen %d too large\n",
					retval);
				retval = 0;
			}
		}
	}
	return retval;
}
示例#2
0
文件: brec.c 项目: 383530895/linux
/* Get the length of the key from a keyed record */
u16 hfs_brec_keylen(struct hfs_bnode *node, u16 rec)
{
	u16 retval, recoff;

	if (node->type != HFS_NODE_INDEX && node->type != HFS_NODE_LEAF)
		return 0;

	if ((node->type == HFS_NODE_INDEX) &&
	   !(node->tree->attributes & HFS_TREE_VARIDXKEYS) &&
	   (node->tree->cnid != HFSPLUS_ATTR_CNID)) {
		retval = node->tree->max_key_len + 2;
	} else {
		recoff = hfs_bnode_read_u16(node,
			node->tree->node_size - (rec + 1) * 2);
		if (!recoff)
			return 0;
		if (recoff > node->tree->node_size - 2) {
			pr_err("recoff %d too large\n", recoff);
			return 0;
		}

		retval = hfs_bnode_read_u16(node, recoff) + 2;
		if (retval > node->tree->max_key_len + 2) {
			pr_err("keylen %d too large\n",
				retval);
			retval = 0;
		}
	}
	return retval;
}
示例#3
0
void hfs_bnode_dump(struct hfs_bnode *node)
{
	struct hfs_bnode_desc desc;
	__be32 cnid;
	int i, off, key_off;

	dprint(DBG_BNODE_MOD, "bnode: %d\n", node->this);
	hfs_bnode_read(node, &desc, 0, sizeof(desc));
	dprint(DBG_BNODE_MOD, "%d, %d, %d, %d, %d\n",
		be32_to_cpu(desc.next), be32_to_cpu(desc.prev),
		desc.type, desc.height, be16_to_cpu(desc.num_recs));

	off = node->tree->node_size - 2;
	for (i = be16_to_cpu(desc.num_recs); i >= 0; off -= 2, i--) {
		key_off = hfs_bnode_read_u16(node, off);
		dprint(DBG_BNODE_MOD, " %d", key_off);
		if (i && node->type == HFS_NODE_INDEX) {
			int tmp;

			if (node->tree->attributes & HFS_TREE_VARIDXKEYS)
				tmp = (hfs_bnode_read_u8(node, key_off) | 1) + 1;
			else
				tmp = node->tree->max_key_len + 1;
			dprint(DBG_BNODE_MOD, " (%d,%d", tmp, hfs_bnode_read_u8(node, key_off));
			hfs_bnode_read(node, &cnid, key_off + tmp, 4);
			dprint(DBG_BNODE_MOD, ",%d)", be32_to_cpu(cnid));
		} else if (i && node->type == HFS_NODE_LEAF) {
			int tmp;

			tmp = hfs_bnode_read_u8(node, key_off);
			dprint(DBG_BNODE_MOD, " (%d)", tmp);
		}
	}
	dprint(DBG_BNODE_MOD, "\n");
}
int hfs_brec_remove(struct hfs_find_data *fd)
{
	struct hfs_btree *tree;
	struct hfs_bnode *node, *parent;
	int end_off, rec_off, data_off, size;

	tree = fd->tree;
	node = fd->bnode;
again:
	rec_off = tree->node_size - (fd->record + 2) * 2;
	end_off = tree->node_size - (node->num_recs + 1) * 2;

	if (node->type == HFS_NODE_LEAF) {
		tree->leaf_count--;
		mark_inode_dirty(tree->inode);
	}
	hfs_bnode_dump(node);
	dprint(DBG_BNODE_MOD, "remove_rec: %d, %d\n",
		fd->record, fd->keylength + fd->entrylength);
	if (!--node->num_recs) {
		hfs_bnode_unlink(node);
		if (!node->parent)
			return 0;
		parent = hfs_bnode_find(tree, node->parent);
		if (IS_ERR(parent))
			return PTR_ERR(parent);
		hfs_bnode_put(node);
		node = fd->bnode = parent;

		__hfs_brec_find(node, fd);
		goto again;
	}
	hfs_bnode_write_u16(node,
		offsetof(struct hfs_bnode_desc, num_recs),
		node->num_recs);

	if (rec_off == end_off)
		goto skip;
	size = fd->keylength + fd->entrylength;

	do {
		data_off = hfs_bnode_read_u16(node, rec_off);
		hfs_bnode_write_u16(node, rec_off + 2, data_off - size);
		rec_off -= 2;
	} while (rec_off >= end_off);

	
	hfs_bnode_move(node, fd->keyoffset, fd->keyoffset + size,
		       data_off - fd->keyoffset - size);
skip:
	hfs_bnode_dump(node);
	if (!fd->record)
		hfs_brec_update_parent(fd);
	return 0;
}
示例#5
0
/* Get the length of the key from a keyed record */
u16 hfs_brec_keylen(struct hfs_bnode *node, u16 rec)
{
	u16 retval, recoff;

	if (node->type != HFS_NODE_INDEX && node->type != HFS_NODE_LEAF)
		return 0;

	if ((node->type == HFS_NODE_INDEX) &&
	   !(node->tree->attributes & HFS_TREE_VARIDXKEYS)) {
		retval = node->tree->max_key_len + 2;
	} else {
		recoff = hfs_bnode_read_u16(node, node->tree->node_size - (rec + 1) * 2);
		if (!recoff)
			return 0;
		if (node->tree->attributes & HFS_TREE_BIGKEYS)
			retval = hfs_bnode_read_u16(node, recoff) + 2;
		else
			retval = (hfs_bnode_read_u8(node, recoff) | 1) + 1;
	}
	return retval;
}
示例#6
0
int hfs_brec_insert(struct hfs_find_data *fd, void *entry, int entry_len)
{
	struct hfs_btree *tree;
	struct hfs_bnode *node, *new_node;
	int size, key_len, rec;
	int data_off, end_off;
	int idx_rec_off, data_rec_off, end_rec_off;
	__be32 cnid;

	tree = fd->tree;
	if (!fd->bnode) {
		if (!tree->root)
			hfs_btree_inc_height(tree);
		fd->bnode = hfs_bnode_find(tree, tree->leaf_head);
		if (IS_ERR(fd->bnode))
			return PTR_ERR(fd->bnode);
		fd->record = -1;
	}
	new_node = NULL;
	key_len = be16_to_cpu(fd->search_key->key_len) + 2;
again:
	/* new record idx and complete record size */
	rec = fd->record + 1;
	size = key_len + entry_len;

	node = fd->bnode;
	hfs_bnode_dump(node);
	/* get last offset */
	end_rec_off = tree->node_size - (node->num_recs + 1) * 2;
	end_off = hfs_bnode_read_u16(node, end_rec_off);
	end_rec_off -= 2;
	dprint(DBG_BNODE_MOD, "insert_rec: %d, %d, %d, %d\n", rec, size, end_off, end_rec_off);
	if (size > end_rec_off - end_off) {
		if (new_node)
			panic("not enough room!\n");
		new_node = hfs_bnode_split(fd);
		if (IS_ERR(new_node))
			return PTR_ERR(new_node);
		goto again;
	}
	if (node->type == HFS_NODE_LEAF) {
		tree->leaf_count++;
		mark_inode_dirty(tree->inode);
	}
	node->num_recs++;
	/* write new last offset */
	hfs_bnode_write_u16(node, offsetof(struct hfs_bnode_desc, num_recs), node->num_recs);
	hfs_bnode_write_u16(node, end_rec_off, end_off + size);
	data_off = end_off;
	data_rec_off = end_rec_off + 2;
	idx_rec_off = tree->node_size - (rec + 1) * 2;
	if (idx_rec_off == data_rec_off)
		goto skip;
	/* move all following entries */
	do {
		data_off = hfs_bnode_read_u16(node, data_rec_off + 2);
		hfs_bnode_write_u16(node, data_rec_off, data_off + size);
		data_rec_off += 2;
	} while (data_rec_off < idx_rec_off);

	/* move data away */
	hfs_bnode_move(node, data_off + size, data_off,
		       end_off - data_off);

skip:
	hfs_bnode_write(node, fd->search_key, data_off, key_len);
	hfs_bnode_write(node, entry, data_off + key_len, entry_len);
	hfs_bnode_dump(node);

	if (new_node) {
		/* update parent key if we inserted a key
		 * at the start of the first node
		 */
		if (!rec && new_node != node)
			hfs_brec_update_parent(fd);

		hfs_bnode_put(fd->bnode);
		if (!new_node->parent) {
			hfs_btree_inc_height(tree);
			new_node->parent = tree->root;
		}
		fd->bnode = hfs_bnode_find(tree, new_node->parent);

		/* create index data entry */
		cnid = cpu_to_be32(new_node->this);
		entry = &cnid;
		entry_len = sizeof(cnid);

		/* get index key */
		hfs_bnode_read_key(new_node, fd->search_key, 14);
		__hfs_brec_find(fd->bnode, fd);

		hfs_bnode_put(new_node);
		new_node = NULL;

		if (tree->attributes & HFS_TREE_VARIDXKEYS)
			key_len = be16_to_cpu(fd->search_key->key_len) + 2;
		else {
			fd->search_key->key_len = cpu_to_be16(tree->max_key_len);
			key_len = tree->max_key_len + 2;
		}
		goto again;
	}

	if (!rec)
		hfs_brec_update_parent(fd);

	return 0;
}
示例#7
0
static struct hfs_bnode *hfs_bnode_split(struct hfs_find_data *fd)
{
	struct hfs_btree *tree;
	struct hfs_bnode *node, *new_node;
	struct hfs_bnode_desc node_desc;
	int num_recs, new_rec_off, new_off, old_rec_off;
	int data_start, data_end, size;

	tree = fd->tree;
	node = fd->bnode;
	new_node = hfs_bmap_alloc(tree);
	if (IS_ERR(new_node))
		return new_node;
	hfs_bnode_get(node);
	dprint(DBG_BNODE_MOD, "split_nodes: %d - %d - %d\n",
		node->this, new_node->this, node->next);
	new_node->next = node->next;
	new_node->prev = node->this;
	new_node->parent = node->parent;
	new_node->type = node->type;
	new_node->height = node->height;

	size = tree->node_size / 2 - node->num_recs * 2 - 14;
	old_rec_off = tree->node_size - 4;
	num_recs = 1;
	for (;;) {
		data_start = hfs_bnode_read_u16(node, old_rec_off);
		if (data_start > size)
			break;
		old_rec_off -= 2;
		if (++num_recs < node->num_recs)
			continue;
		/* panic? */
		hfs_bnode_put(node);
		hfs_bnode_put(new_node);
		return ERR_PTR(-ENOSPC);
	}

	if (fd->record + 1 < num_recs) {
		/* new record is in the lower half,
		 * so leave some more space there
		 */
		old_rec_off += 2;
		num_recs--;
		data_start = hfs_bnode_read_u16(node, old_rec_off);
	} else {
		hfs_bnode_put(node);
		hfs_bnode_get(new_node);
		fd->bnode = new_node;
		fd->record -= num_recs;
		fd->keyoffset -= data_start - 14;
		fd->entryoffset -= data_start - 14;
	}
	new_node->num_recs = node->num_recs - num_recs;
	node->num_recs = num_recs;

	new_rec_off = tree->node_size - 2;
	new_off = 14;
	size = data_start - new_off;
	num_recs = new_node->num_recs;
	data_end = data_start;
	while (num_recs) {
		hfs_bnode_write_u16(new_node, new_rec_off, new_off);
		old_rec_off -= 2;
		new_rec_off -= 2;
		data_end = hfs_bnode_read_u16(node, old_rec_off);
		new_off = data_end - size;
		num_recs--;
	}
	hfs_bnode_write_u16(new_node, new_rec_off, new_off);
	hfs_bnode_copy(new_node, 14, node, data_start, data_end - data_start);

	/* update new bnode header */
	node_desc.next = cpu_to_be32(new_node->next);
	node_desc.prev = cpu_to_be32(new_node->prev);
	node_desc.type = new_node->type;
	node_desc.height = new_node->height;
	node_desc.num_recs = cpu_to_be16(new_node->num_recs);
	node_desc.reserved = 0;
	hfs_bnode_write(new_node, &node_desc, 0, sizeof(node_desc));

	/* update previous bnode header */
	node->next = new_node->this;
	hfs_bnode_read(node, &node_desc, 0, sizeof(node_desc));
	node_desc.next = cpu_to_be32(node->next);
	node_desc.num_recs = cpu_to_be16(node->num_recs);
	hfs_bnode_write(node, &node_desc, 0, sizeof(node_desc));

	/* update next bnode header */
	if (new_node->next) {
		struct hfs_bnode *next_node = hfs_bnode_find(tree, new_node->next);
		next_node->prev = new_node->this;
		hfs_bnode_read(next_node, &node_desc, 0, sizeof(node_desc));
		node_desc.prev = cpu_to_be32(next_node->prev);
		hfs_bnode_write(next_node, &node_desc, 0, sizeof(node_desc));
		hfs_bnode_put(next_node);
	} else if (node->this == tree->leaf_tail) {
示例#8
0
int __hfsplus_setxattr(struct inode *inode, const char *name,
			const void *value, size_t size, int flags)
{
	int err = 0;
	struct hfs_find_data cat_fd;
	hfsplus_cat_entry entry;
	u16 cat_entry_flags, cat_entry_type;
	u16 folder_finderinfo_len = sizeof(struct DInfo) +
					sizeof(struct DXInfo);
	u16 file_finderinfo_len = sizeof(struct FInfo) +
					sizeof(struct FXInfo);

	if ((!S_ISREG(inode->i_mode) &&
			!S_ISDIR(inode->i_mode)) ||
				HFSPLUS_IS_RSRC(inode))
		return -EOPNOTSUPP;

	err = can_set_xattr(inode, name, value, size);
	if (err)
		return err;

	if (strncmp(name, XATTR_MAC_OSX_PREFIX,
				XATTR_MAC_OSX_PREFIX_LEN) == 0)
		name += XATTR_MAC_OSX_PREFIX_LEN;

	if (value == NULL) {
		value = "";
		size = 0;
	}

	err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd);
	if (err) {
		pr_err("can't init xattr find struct\n");
		return err;
	}

	err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
	if (err) {
		pr_err("catalog searching failed\n");
		goto end_setxattr;
	}

	if (!strcmp_xattr_finder_info(name)) {
		if (flags & XATTR_CREATE) {
			pr_err("xattr exists yet\n");
			err = -EOPNOTSUPP;
			goto end_setxattr;
		}
		hfs_bnode_read(cat_fd.bnode, &entry, cat_fd.entryoffset,
					sizeof(hfsplus_cat_entry));
		if (be16_to_cpu(entry.type) == HFSPLUS_FOLDER) {
			if (size == folder_finderinfo_len) {
				memcpy(&entry.folder.user_info, value,
						folder_finderinfo_len);
				hfs_bnode_write(cat_fd.bnode, &entry,
					cat_fd.entryoffset,
					sizeof(struct hfsplus_cat_folder));
				hfsplus_mark_inode_dirty(inode,
						HFSPLUS_I_CAT_DIRTY);
			} else {
				err = -ERANGE;
				goto end_setxattr;
			}
		} else if (be16_to_cpu(entry.type) == HFSPLUS_FILE) {
			if (size == file_finderinfo_len) {
				memcpy(&entry.file.user_info, value,
						file_finderinfo_len);
				hfs_bnode_write(cat_fd.bnode, &entry,
					cat_fd.entryoffset,
					sizeof(struct hfsplus_cat_file));
				hfsplus_mark_inode_dirty(inode,
						HFSPLUS_I_CAT_DIRTY);
			} else {
				err = -ERANGE;
				goto end_setxattr;
			}
		} else {
			err = -EOPNOTSUPP;
			goto end_setxattr;
		}
		goto end_setxattr;
	}

	if (!HFSPLUS_SB(inode->i_sb)->attr_tree) {
		err = -EOPNOTSUPP;
		goto end_setxattr;
	}

	if (hfsplus_attr_exists(inode, name)) {
		if (flags & XATTR_CREATE) {
			pr_err("xattr exists yet\n");
			err = -EOPNOTSUPP;
			goto end_setxattr;
		}
		err = hfsplus_delete_attr(inode, name);
		if (err)
			goto end_setxattr;
		err = hfsplus_create_attr(inode, name, value, size);
		if (err)
			goto end_setxattr;
	} else {
		if (flags & XATTR_REPLACE) {
			pr_err("cannot replace xattr\n");
			err = -EOPNOTSUPP;
			goto end_setxattr;
		}
		err = hfsplus_create_attr(inode, name, value, size);
		if (err)
			goto end_setxattr;
	}

	cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset);
	if (cat_entry_type == HFSPLUS_FOLDER) {
		cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode,
				    cat_fd.entryoffset +
				    offsetof(struct hfsplus_cat_folder, flags));
		cat_entry_flags |= HFSPLUS_XATTR_EXISTS;
		if (!strcmp_xattr_acl(name))
			cat_entry_flags |= HFSPLUS_ACL_EXISTS;
		hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
				offsetof(struct hfsplus_cat_folder, flags),
				cat_entry_flags);
		hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
	} else if (cat_entry_type == HFSPLUS_FILE) {