static int
befs_bt_read_node(struct super_block *sb, befs_data_stream * ds,
befs_btree_node * node, befs_off_t node_off)
{
uint off = 0;
befs_debug(sb, "---> befs_bt_read_node()");
if (node->bh)
brelse(node->bh);
node->bh = befs_read_datastream(sb, ds, node_off, &off);
if (!node->bh) {
befs_error(sb, "befs_bt_read_node() failed to read "
"node at %Lu", node_off);
befs_debug(sb, "<--- befs_bt_read_node() ERROR");
return BEFS_ERR;
}
node->od_node =
(befs_btree_nodehead *) ((void *) node->bh->b_data + off);
befs_dump_index_node(sb, node->od_node);
node->head.left = fs64_to_cpu(sb, node->od_node->left);
node->head.right = fs64_to_cpu(sb, node->od_node->right);
node->head.overflow = fs64_to_cpu(sb, node->od_node->overflow);
node->head.all_key_count =
fs16_to_cpu(sb, node->od_node->all_key_count);
node->head.all_key_length =
fs16_to_cpu(sb, node->od_node->all_key_length);
befs_debug(sb, "<--- befs_btree_read_node()");
return BEFS_OK;
}
/**
* befs_read_lsmylink - read long symlink from datastream.
* @sb: Filesystem superblock
* @ds: Datastrem to read from
* @buf: Buffer in which to place long symlink data
* @len: Length of the long symlink in bytes
*
* Returns the number of bytes read
*/
size_t
befs_read_lsymlink(struct super_block * sb, befs_data_stream * ds, void *buff,
befs_off_t len)
{
befs_off_t bytes_read = 0; /* bytes readed */
u16 plen;
struct buffer_head *bh = NULL;
befs_debug(sb, "---> befs_read_lsymlink() length: %Lu", len);
while (bytes_read < len) {
bh = befs_read_datastream(sb, ds, bytes_read, NULL);
if (!bh) {
befs_error(sb, "BeFS: Error reading datastream block "
"starting from %Lu", bytes_read);
befs_debug(sb, "<--- befs_read_lsymlink() ERROR");
return bytes_read;
}
plen = ((bytes_read + BEFS_SB(sb)->block_size) < len) ?
BEFS_SB(sb)->block_size : len - bytes_read;
memcpy(buff + bytes_read, bh->b_data, plen);
brelse(bh);
bytes_read += plen;
}
befs_debug(sb, "<--- befs_read_lsymlink() read %u bytes", bytes_read);
return bytes_read;
}
/**
* befs_bt_read_super - read in btree superblock convert to cpu byteorder
* @sb: Filesystem superblock
* @ds: Datastream to read from
* @sup: Buffer in which to place the btree superblock
*
* Calls befs_read_datastream to read in the btree superblock and
* makes sure it is in cpu byteorder, byteswapping if necessary.
*
* On success, returns BEFS_OK and *@sup contains the btree superblock,
* in cpu byte order.
*
* On failure, BEFS_ERR is returned.
*/
static int
befs_bt_read_super(struct super_block *sb, befs_data_stream * ds,
befs_btree_super * sup)
{
struct buffer_head *bh = NULL;
befs_disk_btree_super *od_sup = NULL;
befs_debug(sb, "---> befs_btree_read_super()");
bh = befs_read_datastream(sb, ds, 0, NULL);
if (!bh) {
befs_error(sb, "Couldn't read index header.");
goto error;
}
od_sup = (befs_disk_btree_super *) bh->b_data;
befs_dump_index_entry(sb, od_sup);
sup->magic = fs32_to_cpu(sb, od_sup->magic);
sup->node_size = fs32_to_cpu(sb, od_sup->node_size);
sup->max_depth = fs32_to_cpu(sb, od_sup->max_depth);
sup->data_type = fs32_to_cpu(sb, od_sup->data_type);
sup->root_node_ptr = fs64_to_cpu(sb, od_sup->root_node_ptr);
sup->free_node_ptr = fs64_to_cpu(sb, od_sup->free_node_ptr);
sup->max_size = fs64_to_cpu(sb, od_sup->max_size);
brelse(bh);
if (sup->magic != BEFS_BTREE_MAGIC) {
befs_error(sb, "Index header has bad magic.");
goto error;
}
befs_debug(sb, "<--- befs_btree_read_super()");
return BEFS_OK;
error:
befs_debug(sb, "<--- befs_btree_read_super() ERROR");
return BEFS_ERR;
}