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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 "glusterfs.h"
#include "xlator.h"
#include "dht-common.h"
#include "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 inline
gf_boolean_t
dht_munge_name (const char *original, char *modified, size_t len, regex_t *re)
{
regmatch_t matches[2];
size_t new_len;
if (regexec(re,original,2,matches,0) != 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 = this->private;
size_t len = 0;
gf_boolean_t munged = _gf_false;
/*
* It wouldn't be safe to use alloca in an inline function that doesn't
* actually get inlined, and it wouldn't be efficient to do a real
* allocation, so we use alloca here (if needed) and pass that to the
* inline.
*/
if (priv->extra_regex_valid) {
len = strlen(name) + 1;
rsync_friendly_name = alloca(len);
munged = dht_munge_name (name, rsync_friendly_name, len,
&priv->extra_regex);
}
if (!munged && priv->rsync_regex_valid) {
len = strlen(name) + 1;
rsync_friendly_name = alloca(len);
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) {
gf_msg_debug (this->name, 0,
"munged down to %s", rsync_friendly_name);
}
}
if (!munged) {
rsync_friendly_name = (char *)name;
}
return dht_hash_compute_internal (type, rsync_friendly_name, hash_p);
}
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