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/*
Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#include "dht-common.h"
#include <glusterfs/hashfn.h>
int
dht_hash_compute_internal(int type, const char *name, uint32_t *hash_p)
{
int ret = 0;
uint32_t hash = 0;
switch (type) {
case DHT_HASH_TYPE_DM:
case DHT_HASH_TYPE_DM_USER:
hash = gf_dm_hashfn(name, strlen(name));
break;
default:
ret = -1;
break;
}
if (ret == 0) {
*hash_p = hash;
}
return ret;
}
static gf_boolean_t
dht_munge_name(const char *original, char *modified, size_t len, regex_t *re)
{
regmatch_t matches[2] = {
{0},
};
size_t new_len = 0;
int ret = 0;
ret = regexec(re, original, 2, matches, 0);
if (ret != REG_NOMATCH) {
if (matches[1].rm_so != -1) {
new_len = matches[1].rm_eo - matches[1].rm_so;
/* Equal would fail due to the NUL at the end. */
if (new_len < len) {
memcpy(modified, original + matches[1].rm_so, new_len);
modified[new_len] = '\0';
return _gf_true;
}
}
}
/* This is guaranteed safe because of how the dest was allocated. */
strcpy(modified, original);
return _gf_false;
}
int
dht_hash_compute(xlator_t *this, int type, const char *name, uint32_t *hash_p)
{
char *rsync_friendly_name = NULL;
dht_conf_t *priv = NULL;
size_t len = 0;
gf_boolean_t munged = _gf_false;
priv = this->private;
len = strlen(name) + 1;
rsync_friendly_name = alloca(len);
LOCK(&priv->lock);
{
if (priv->extra_regex_valid) {
munged = dht_munge_name(name, rsync_friendly_name, len,
&priv->extra_regex);
}
if (!munged && priv->rsync_regex_valid) {
gf_msg_trace(this->name, 0, "trying regex for %s", name);
munged = dht_munge_name(name, rsync_friendly_name, len,
&priv->rsync_regex);
if (munged) {
UNLOCK(&priv->lock);
gf_msg_debug(this->name, 0, "munged down to %s",
rsync_friendly_name);
goto post_unlock;
}
}
}
UNLOCK(&priv->lock);
post_unlock:
if (!munged) {
rsync_friendly_name = (char *)name;
}
return dht_hash_compute_internal(type, rsync_friendly_name, hash_p);
}
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