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util.c
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/******************************************************************************
*******************************************************************************
**
** Copyright (C) 2005 Red Hat, Inc. All rights reserved.
**
** This copyrighted material is made available to anyone wishing to use,
** modify, copy, or redistribute it subject to the terms and conditions
** of the GNU General Public License v.2.
**
*******************************************************************************
******************************************************************************/
#include "dlm_internal.h"
#include "rcom.h"
/**
* dlm_hash - hash an array of data
* @data: the data to be hashed
* @len: the length of data to be hashed
*
* Copied from GFS which copied from...
*
* Take some data and convert it to a 32-bit hash.
* This is the 32-bit FNV-1a hash from:
* http://www.isthe.com/chongo/tech/comp/fnv/
*/
static __inline__ uint32_t
hash_more_internal(const void *data, unsigned int len, uint32_t hash)
{
unsigned char *p = (unsigned char *)data;
unsigned char *e = p + len;
uint32_t h = hash;
while (p < e) {
h ^= (uint32_t)(*p++);
h *= 0x01000193;
}
return h;
}
uint32_t dlm_hash(const void *data, int len)
{
uint32_t h = 0x811C9DC5;
h = hash_more_internal(data, len, h);
return h;
}
static void header_out(struct dlm_header *hd)
{
hd->h_version = cpu_to_le32(hd->h_version);
hd->h_lockspace = cpu_to_le32(hd->h_lockspace);
hd->h_nodeid = cpu_to_le32(hd->h_nodeid);
hd->h_length = cpu_to_le16(hd->h_length);
}
static void header_in(struct dlm_header *hd)
{
hd->h_version = le32_to_cpu(hd->h_version);
hd->h_lockspace = le32_to_cpu(hd->h_lockspace);
hd->h_nodeid = le32_to_cpu(hd->h_nodeid);
hd->h_length = le16_to_cpu(hd->h_length);
}
void dlm_message_out(struct dlm_message *ms)
{
struct dlm_header *hd = (struct dlm_header *) ms;
header_out(hd);
ms->m_type = cpu_to_le32(ms->m_type);
ms->m_nodeid = cpu_to_le32(ms->m_nodeid);
ms->m_pid = cpu_to_le32(ms->m_pid);
ms->m_lkid = cpu_to_le32(ms->m_lkid);
ms->m_remlkid = cpu_to_le32(ms->m_remlkid);
ms->m_lkid_parent = cpu_to_le32(ms->m_lkid_parent);
ms->m_remlkid_parent = cpu_to_le32(ms->m_remlkid_parent);
ms->m_exflags = cpu_to_le32(ms->m_exflags);
ms->m_sbflags = cpu_to_le32(ms->m_sbflags);
ms->m_flags = cpu_to_le32(ms->m_flags);
ms->m_lvbseq = cpu_to_le32(ms->m_lvbseq);
ms->m_status = cpu_to_le32(ms->m_status);
ms->m_grmode = cpu_to_le32(ms->m_grmode);
ms->m_rqmode = cpu_to_le32(ms->m_rqmode);
ms->m_bastmode = cpu_to_le32(ms->m_bastmode);
ms->m_asts = cpu_to_le32(ms->m_asts);
ms->m_result = cpu_to_le32(ms->m_result);
ms->m_range[0] = cpu_to_le64(ms->m_range[0]);
ms->m_range[1] = cpu_to_le64(ms->m_range[1]);
}
void dlm_message_in(struct dlm_message *ms)
{
struct dlm_header *hd = (struct dlm_header *) ms;
header_in(hd);
ms->m_type = le32_to_cpu(ms->m_type);
ms->m_nodeid = le32_to_cpu(ms->m_nodeid);
ms->m_pid = le32_to_cpu(ms->m_pid);
ms->m_lkid = le32_to_cpu(ms->m_lkid);
ms->m_remlkid = le32_to_cpu(ms->m_remlkid);
ms->m_lkid_parent = le32_to_cpu(ms->m_lkid_parent);
ms->m_remlkid_parent = le32_to_cpu(ms->m_remlkid_parent);
ms->m_exflags = le32_to_cpu(ms->m_exflags);
ms->m_sbflags = le32_to_cpu(ms->m_sbflags);
ms->m_flags = le32_to_cpu(ms->m_flags);
ms->m_lvbseq = le32_to_cpu(ms->m_lvbseq);
ms->m_status = le32_to_cpu(ms->m_status);
ms->m_grmode = le32_to_cpu(ms->m_grmode);
ms->m_rqmode = le32_to_cpu(ms->m_rqmode);
ms->m_bastmode = le32_to_cpu(ms->m_bastmode);
ms->m_asts = le32_to_cpu(ms->m_asts);
ms->m_result = le32_to_cpu(ms->m_result);
ms->m_range[0] = le64_to_cpu(ms->m_range[0]);
ms->m_range[1] = le64_to_cpu(ms->m_range[1]);
}
static void rcom_lock_out(struct rcom_lock *rl)
{
rl->rl_ownpid = cpu_to_le32(rl->rl_ownpid);
rl->rl_id = cpu_to_le32(rl->rl_id);
rl->rl_remid = cpu_to_le32(rl->rl_remid);
rl->rl_parent_lkid = cpu_to_le32(rl->rl_parent_lkid);
rl->rl_exflags = cpu_to_le32(rl->rl_exflags);
rl->rl_flags = cpu_to_le32(rl->rl_flags);
rl->rl_lvbseq = cpu_to_le32(rl->rl_lvbseq);
rl->rl_result = cpu_to_le32(rl->rl_result);
rl->rl_namelen = cpu_to_le16(rl->rl_namelen);
rl->rl_subnamelen = cpu_to_le16(rl->rl_subnamelen);
rl->rl_range[0] = cpu_to_le64(rl->rl_range[0]);
rl->rl_range[1] = cpu_to_le64(rl->rl_range[1]);
rl->rl_range[2] = cpu_to_le64(rl->rl_range[2]);
rl->rl_range[3] = cpu_to_le64(rl->rl_range[3]);
}
static void rcom_lock_in(struct rcom_lock *rl)
{
rl->rl_ownpid = le32_to_cpu(rl->rl_ownpid);
rl->rl_id = le32_to_cpu(rl->rl_id);
rl->rl_remid = le32_to_cpu(rl->rl_remid);
rl->rl_parent_lkid = le32_to_cpu(rl->rl_parent_lkid);
rl->rl_exflags = le32_to_cpu(rl->rl_exflags);
rl->rl_flags = le32_to_cpu(rl->rl_flags);
rl->rl_lvbseq = le32_to_cpu(rl->rl_lvbseq);
rl->rl_result = le32_to_cpu(rl->rl_result);
rl->rl_namelen = le16_to_cpu(rl->rl_namelen);
rl->rl_subnamelen = le16_to_cpu(rl->rl_subnamelen);
rl->rl_range[0] = le64_to_cpu(rl->rl_range[0]);
rl->rl_range[1] = le64_to_cpu(rl->rl_range[1]);
rl->rl_range[2] = le64_to_cpu(rl->rl_range[2]);
rl->rl_range[3] = le64_to_cpu(rl->rl_range[3]);
}
void dlm_rcom_out(struct dlm_rcom *rc)
{
struct dlm_header *hd = (struct dlm_header *) rc;
int type = rc->rc_type;
header_out(hd);
rc->rc_type = cpu_to_le16(rc->rc_type);
rc->rc_result = cpu_to_le16(rc->rc_result);
rc->rc_id = cpu_to_le64(rc->rc_id);
if (type == DLM_RCOM_LOCK)
rcom_lock_out((struct rcom_lock *) rc->rc_buf);
}
void dlm_rcom_in(struct dlm_rcom *rc)
{
struct dlm_header *hd = (struct dlm_header *) rc;
header_in(hd);
rc->rc_type = le16_to_cpu(rc->rc_type);
rc->rc_result = le16_to_cpu(rc->rc_result);
rc->rc_id = le64_to_cpu(rc->rc_id);
if (rc->rc_type == DLM_RCOM_LOCK)
rcom_lock_in((struct rcom_lock *) rc->rc_buf);
}

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