// if root directory is empty - we set default - Yura's - hash and
// warn about it
// FIXME: we look for only one name in a directory. If tea and yura
// bith have the same value - we ask user to send report to the
// mailing list
__u32 find_hash_out (struct super_block * s)
{
int retval;
struct inode * inode;
struct cpu_key key;
INITIALIZE_PATH (path);
struct reiserfs_dir_entry de;
__u32 hash = DEFAULT_HASH;
inode = s->s_root->d_inode;
do { // Some serious "goto"-hater was there ;)
u32 teahash, r5hash, yurahash;
make_cpu_key (&key, inode, ~0, TYPE_DIRENTRY, 3);
retval = search_by_entry_key (s, &key, &path, &de);
if (retval == IO_ERROR) {
pathrelse (&path);
return UNSET_HASH ;
}
if (retval == NAME_NOT_FOUND)
de.de_entry_num --;
set_de_name_and_namelen (&de);
if (deh_offset( &(de.de_deh[de.de_entry_num]) ) == DOT_DOT_OFFSET) {
/* allow override in this case */
if (reiserfs_rupasov_hash(s)) {
hash = YURA_HASH ;
}
reiserfs_warning("reiserfs: FS seems to be empty, autodetect "
"is using the default hash\n");
break;
}
r5hash=GET_HASH_VALUE (r5_hash (de.de_name, de.de_namelen));
teahash=GET_HASH_VALUE (keyed_hash (de.de_name, de.de_namelen));
yurahash=GET_HASH_VALUE (yura_hash (de.de_name, de.de_namelen));
if ( ( (teahash == r5hash) && (GET_HASH_VALUE( deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash) ) ||
( (teahash == yurahash) && (yurahash == GET_HASH_VALUE( deh_offset(&(de.de_deh[de.de_entry_num])))) ) ||
( (r5hash == yurahash) && (yurahash == GET_HASH_VALUE( deh_offset(&(de.de_deh[de.de_entry_num])))) ) ) {
reiserfs_warning("reiserfs: Unable to automatically detect hash"
"function for device %s\n"
"please mount with -o hash={tea,rupasov,r5}\n", kdevname (s->s_dev));
hash = UNSET_HASH;
break;
}
if (GET_HASH_VALUE( deh_offset(&(de.de_deh[de.de_entry_num])) ) == yurahash)
hash = YURA_HASH;
else if (GET_HASH_VALUE( deh_offset(&(de.de_deh[de.de_entry_num])) ) == teahash)
hash = TEA_HASH;
else if (GET_HASH_VALUE( deh_offset(&(de.de_deh[de.de_entry_num])) ) == r5hash)
hash = R5_HASH;
else {
reiserfs_warning("reiserfs: Unrecognised hash function for "
"device %s\n", kdevname (s->s_dev));
hash = UNSET_HASH;
}
} while (0);
pathrelse (&path);
return hash;
}
/*
* If root directory is empty - we set default - Yura's - hash and warn
* about it.
* FIXME: we look for only one name in a directory. If tea and yura both
* have the same value - we ask user to send report to the mailing list
*/
uint32_t find_hash_out(struct reiserfs_mount *rmp)
{
int retval;
struct cpu_key key;
INITIALIZE_PATH(path);
struct reiserfs_node *ip;
struct reiserfs_sb_info *sbi;
struct reiserfs_dir_entry de;
uint32_t hash = DEFAULT_HASH;
get_root_node(rmp, &ip);
if (!ip)
return (UNSET_HASH);
sbi = rmp->rm_reiserfs;
do {
uint32_t teahash, r5hash, yurahash;
reiserfs_log(LOG_DEBUG, "make_cpu_key\n");
make_cpu_key(&key, ip, ~0, TYPE_DIRENTRY, 3);
reiserfs_log(LOG_DEBUG, "search_by_entry_key for "
"key(objectid=%d,dirid=%d)\n",
key.on_disk_key.k_objectid, key.on_disk_key.k_dir_id);
retval = search_by_entry_key(sbi, &key, &path, &de);
if (retval == IO_ERROR) {
pathrelse(&path);
return (UNSET_HASH);
}
if (retval == NAME_NOT_FOUND)
de.de_entry_num--;
reiserfs_log(LOG_DEBUG, "name found\n");
set_de_name_and_namelen(&de);
if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
/* Allow override in this case */
if (reiserfs_rupasov_hash(sbi)) {
hash = YURA_HASH;
}
reiserfs_log(LOG_DEBUG,
"FS seems to be empty, autodetect "
"is using the default hash");
break;
}
r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
teahash = GET_HASH_VALUE(keyed_hash(de.de_name,
de.de_namelen));
yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
if (((teahash == r5hash) &&
(GET_HASH_VALUE(
deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)) ||
((teahash == yurahash) &&
(yurahash ==
GET_HASH_VALUE(
deh_offset(&(de.de_deh[de.de_entry_num]))))) ||
((r5hash == yurahash) &&
(yurahash ==
GET_HASH_VALUE(
deh_offset(&(de.de_deh[de.de_entry_num])))))) {
reiserfs_log(LOG_ERR,
"unable to automatically detect hash "
"function. Please mount with -o "
"hash={tea,rupasov,r5}");
hash = UNSET_HASH;
break;
}
if (GET_HASH_VALUE(
deh_offset(&(de.de_deh[de.de_entry_num]))) == yurahash) {
reiserfs_log(LOG_DEBUG, "detected YURA hash\n");
hash = YURA_HASH;
} else if (GET_HASH_VALUE(
deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash) {
reiserfs_log(LOG_DEBUG, "detected TEA hash\n");
hash = TEA_HASH;
} else if (GET_HASH_VALUE(
deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash) {
reiserfs_log(LOG_DEBUG, "detected R5 hash\n");
hash = R5_HASH;
} else {
reiserfs_log(LOG_WARNING, "unrecognised hash function");
hash = UNSET_HASH;
}
} while (0);
pathrelse(&path);
return (hash);
}
