/* first calls search_by_key, then, if item is not found looks for the entry inside directory item indicated by
search_by_key. (We assign a key to each directory item, and place multiple entries in a single directory item.)
Fills the path to the entry, and to the entry position in the item */
int search_by_entry_key (struct super_block * sb, struct key * key, struct path * path, int * pos_in_item, int * repeat)
{
/* search for a directory item using key of entry */
if (search_by_key (sb, key, path, repeat, DISK_LEAF_NODE_LEVEL, READ_BLOCKS) == ITEM_FOUND) {
*pos_in_item = 0;
return POSITION_FOUND;
}
#ifdef REISERFS_CHECK
if (!PATH_LAST_POSITION (path))
reiserfs_panic (sb, "vs-7000: search_by_entry_key: search_by_key returned item position == 0");
#endif /* REISERFS_CHECK */
PATH_LAST_POSITION (path) --;
#ifdef REISERFS_CHECK
{
struct item_head * ih = B_N_PITEM_HEAD (PATH_PLAST_BUFFER (path), PATH_LAST_POSITION (path));
if (!I_IS_DIRECTORY_ITEM (ih) || COMP_SHORT_KEYS (&(ih->ih_key), key)) {
print_block (PATH_PLAST_BUFFER (path), 0, -1, -1);
reiserfs_panic (sb, "vs-7005: search_by_entry_key: found item %h is not directory item or "
"does not belong to the same directory as key %k", ih, key);
}
}
#endif /* REISERFS_CHECK */
/* binary search in directory item by third component of the key */
return bin_search_in_dir_item (PATH_PITEM_HEAD (path), B_I_DEH (PATH_PLAST_BUFFER (path), PATH_PITEM_HEAD (path)), key, pos_in_item);
}
static int reiserfs_find_entry (struct inode * dir, const char * name, int namelen, struct path * path_to_entry, struct reiserfs_dir_entry * de)
{
struct key key_to_search;
int repeat;
int retval;
if (!dir || !dir->i_sb)
return POSITION_NOT_FOUND;
if ((unsigned int)namelen > REISERFS_MAX_NAME_LEN (dir->i_sb->s_blocksize))
return POSITION_NOT_FOUND;
/* there are no entries having the same third component of key, so
fourth key component is not used */
copy_key (&key_to_search, INODE_PKEY (dir));
key_to_search.k_offset = get_third_component (name, namelen);
key_to_search.k_uniqueness = DIRENTRY_UNIQUENESS;
while (1) {
/* search for a directory item using the formed key */
if (search_by_key (dir->i_sb, &key_to_search, path_to_entry, &repeat, DISK_LEAF_NODE_LEVEL, READ_BLOCKS) == ITEM_NOT_FOUND) {
/* take previous item */
#ifdef REISERFS_CHECK
if (!PATH_LAST_POSITION (path_to_entry))
reiserfs_panic (dir->i_sb, "vs-7010: reiserfs_find_entry: search_by_key returned bad position == 0");
#endif /* REISERFS_CHECK */
PATH_LAST_POSITION (path_to_entry) --;
}
de->de_bh = PATH_PLAST_BUFFER (path_to_entry);
de->de_item_num = PATH_LAST_POSITION (path_to_entry);
de->de_ih = B_N_PITEM_HEAD (de->de_bh, de->de_item_num);
de->de_deh = B_I_DEH (de->de_bh, de->de_ih);
#ifdef REISERFS_CHECK
if (!I_IS_DIRECTORY_ITEM (de->de_ih) || COMP_SHORT_KEYS (&(de->de_ih->ih_key), INODE_PKEY (dir)))
reiserfs_panic (dir->i_sb, "vs-7020: reiserfs_find_entry: item must be an item of the same directory item as inode");
#endif /* REISERFS_CHECK */
/* we do not check whether bin_search_in_dir_item found the given key, even if so, we still have
to compare names */
bin_search_in_dir_item (de->de_ih, de->de_deh, &key_to_search, &(de->de_entry_num));
/* compare names for all entries having given hash value */
retval = linear_search_in_dir_item (&key_to_search, de, name, namelen);
if (retval != GOTO_PREVIOUS_ITEM)
/* there is no need to scan directory anymore. Given entry found or does not exist */
return retval;
/* there is left neighboring item of this directory and given entry can be there */
key_to_search.k_offset = de->de_ih->ih_key.k_offset - 1;
pathrelse (path_to_entry);
} /* while (1) */
}
void run_test (FILE *data_stream, FILE *test_in, FILE *test_out)
{
int num_of_request;
unsigned short ordered_rids[100];
char num_of_request_str[10];
char target_key[20];
struct page result;
num_of_request = atoi (fget_num (num_of_request_str, 10, test_in));
while (num_of_request--)
{
init_page (&result, true);
fget_num (target_key, 20, test_in); // Get a request.
if (search_by_key (target_key, &result, data_stream)) // sth worng here!!!
{
sort_record_in_page (&result, 2, ordered_rids);
put_result (&result, ordered_rids, test_out);
}
else
fprintf (test_out, "%d\r\n", -1);
}
}
