442 строки
10 KiB
C
442 строки
10 KiB
C
/******************************************************************************
|
|
*******************************************************************************
|
|
**
|
|
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
|
|
** Copyright (C) 2004-2005 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 "lockspace.h"
|
|
#include "member.h"
|
|
#include "lowcomms.h"
|
|
#include "rcom.h"
|
|
#include "config.h"
|
|
#include "memory.h"
|
|
#include "recover.h"
|
|
#include "util.h"
|
|
#include "lock.h"
|
|
#include "dir.h"
|
|
|
|
|
|
static void put_free_de(struct dlm_ls *ls, struct dlm_direntry *de)
|
|
{
|
|
spin_lock(&ls->ls_recover_list_lock);
|
|
list_add(&de->list, &ls->ls_recover_list);
|
|
spin_unlock(&ls->ls_recover_list_lock);
|
|
}
|
|
|
|
static struct dlm_direntry *get_free_de(struct dlm_ls *ls, int len)
|
|
{
|
|
int found = 0;
|
|
struct dlm_direntry *de;
|
|
|
|
spin_lock(&ls->ls_recover_list_lock);
|
|
list_for_each_entry(de, &ls->ls_recover_list, list) {
|
|
if (de->length == len) {
|
|
list_del(&de->list);
|
|
de->master_nodeid = 0;
|
|
memset(de->name, 0, len);
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&ls->ls_recover_list_lock);
|
|
|
|
if (!found)
|
|
de = kzalloc(sizeof(struct dlm_direntry) + len, GFP_KERNEL);
|
|
return de;
|
|
}
|
|
|
|
void dlm_clear_free_entries(struct dlm_ls *ls)
|
|
{
|
|
struct dlm_direntry *de;
|
|
|
|
spin_lock(&ls->ls_recover_list_lock);
|
|
while (!list_empty(&ls->ls_recover_list)) {
|
|
de = list_entry(ls->ls_recover_list.next, struct dlm_direntry,
|
|
list);
|
|
list_del(&de->list);
|
|
kfree(de);
|
|
}
|
|
spin_unlock(&ls->ls_recover_list_lock);
|
|
}
|
|
|
|
/*
|
|
* We use the upper 16 bits of the hash value to select the directory node.
|
|
* Low bits are used for distribution of rsb's among hash buckets on each node.
|
|
*
|
|
* To give the exact range wanted (0 to num_nodes-1), we apply a modulus of
|
|
* num_nodes to the hash value. This value in the desired range is used as an
|
|
* offset into the sorted list of nodeid's to give the particular nodeid.
|
|
*/
|
|
|
|
int dlm_hash2nodeid(struct dlm_ls *ls, uint32_t hash)
|
|
{
|
|
struct list_head *tmp;
|
|
struct dlm_member *memb = NULL;
|
|
uint32_t node, n = 0;
|
|
int nodeid;
|
|
|
|
if (ls->ls_num_nodes == 1) {
|
|
nodeid = dlm_our_nodeid();
|
|
goto out;
|
|
}
|
|
|
|
if (ls->ls_node_array) {
|
|
node = (hash >> 16) % ls->ls_total_weight;
|
|
nodeid = ls->ls_node_array[node];
|
|
goto out;
|
|
}
|
|
|
|
/* make_member_array() failed to kmalloc ls_node_array... */
|
|
|
|
node = (hash >> 16) % ls->ls_num_nodes;
|
|
|
|
list_for_each(tmp, &ls->ls_nodes) {
|
|
if (n++ != node)
|
|
continue;
|
|
memb = list_entry(tmp, struct dlm_member, list);
|
|
break;
|
|
}
|
|
|
|
DLM_ASSERT(memb , printk("num_nodes=%u n=%u node=%u\n",
|
|
ls->ls_num_nodes, n, node););
|
|
nodeid = memb->nodeid;
|
|
out:
|
|
return nodeid;
|
|
}
|
|
|
|
int dlm_dir_nodeid(struct dlm_rsb *r)
|
|
{
|
|
return dlm_hash2nodeid(r->res_ls, r->res_hash);
|
|
}
|
|
|
|
static inline uint32_t dir_hash(struct dlm_ls *ls, char *name, int len)
|
|
{
|
|
uint32_t val;
|
|
|
|
val = jhash(name, len, 0);
|
|
val &= (ls->ls_dirtbl_size - 1);
|
|
|
|
return val;
|
|
}
|
|
|
|
static void add_entry_to_hash(struct dlm_ls *ls, struct dlm_direntry *de)
|
|
{
|
|
uint32_t bucket;
|
|
|
|
bucket = dir_hash(ls, de->name, de->length);
|
|
list_add_tail(&de->list, &ls->ls_dirtbl[bucket].list);
|
|
}
|
|
|
|
static struct dlm_direntry *search_bucket(struct dlm_ls *ls, char *name,
|
|
int namelen, uint32_t bucket)
|
|
{
|
|
struct dlm_direntry *de;
|
|
|
|
list_for_each_entry(de, &ls->ls_dirtbl[bucket].list, list) {
|
|
if (de->length == namelen && !memcmp(name, de->name, namelen))
|
|
goto out;
|
|
}
|
|
de = NULL;
|
|
out:
|
|
return de;
|
|
}
|
|
|
|
void dlm_dir_remove_entry(struct dlm_ls *ls, int nodeid, char *name, int namelen)
|
|
{
|
|
struct dlm_direntry *de;
|
|
uint32_t bucket;
|
|
|
|
bucket = dir_hash(ls, name, namelen);
|
|
|
|
write_lock(&ls->ls_dirtbl[bucket].lock);
|
|
|
|
de = search_bucket(ls, name, namelen, bucket);
|
|
|
|
if (!de) {
|
|
log_error(ls, "remove fr %u none", nodeid);
|
|
goto out;
|
|
}
|
|
|
|
if (de->master_nodeid != nodeid) {
|
|
log_error(ls, "remove fr %u ID %u", nodeid, de->master_nodeid);
|
|
goto out;
|
|
}
|
|
|
|
list_del(&de->list);
|
|
kfree(de);
|
|
out:
|
|
write_unlock(&ls->ls_dirtbl[bucket].lock);
|
|
}
|
|
|
|
void dlm_dir_clear(struct dlm_ls *ls)
|
|
{
|
|
struct list_head *head;
|
|
struct dlm_direntry *de;
|
|
int i;
|
|
|
|
DLM_ASSERT(list_empty(&ls->ls_recover_list), );
|
|
|
|
for (i = 0; i < ls->ls_dirtbl_size; i++) {
|
|
write_lock(&ls->ls_dirtbl[i].lock);
|
|
head = &ls->ls_dirtbl[i].list;
|
|
while (!list_empty(head)) {
|
|
de = list_entry(head->next, struct dlm_direntry, list);
|
|
list_del(&de->list);
|
|
put_free_de(ls, de);
|
|
}
|
|
write_unlock(&ls->ls_dirtbl[i].lock);
|
|
}
|
|
}
|
|
|
|
int dlm_recover_directory(struct dlm_ls *ls)
|
|
{
|
|
struct dlm_member *memb;
|
|
struct dlm_direntry *de;
|
|
char *b, *last_name = NULL;
|
|
int error = -ENOMEM, last_len, count = 0;
|
|
uint16_t namelen;
|
|
|
|
log_debug(ls, "dlm_recover_directory");
|
|
|
|
if (dlm_no_directory(ls))
|
|
goto out_status;
|
|
|
|
dlm_dir_clear(ls);
|
|
|
|
last_name = kmalloc(DLM_RESNAME_MAXLEN, GFP_KERNEL);
|
|
if (!last_name)
|
|
goto out;
|
|
|
|
list_for_each_entry(memb, &ls->ls_nodes, list) {
|
|
memset(last_name, 0, DLM_RESNAME_MAXLEN);
|
|
last_len = 0;
|
|
|
|
for (;;) {
|
|
int left;
|
|
error = dlm_recovery_stopped(ls);
|
|
if (error)
|
|
goto out_free;
|
|
|
|
error = dlm_rcom_names(ls, memb->nodeid,
|
|
last_name, last_len);
|
|
if (error)
|
|
goto out_free;
|
|
|
|
schedule();
|
|
|
|
/*
|
|
* pick namelen/name pairs out of received buffer
|
|
*/
|
|
|
|
b = ls->ls_recover_buf->rc_buf;
|
|
left = ls->ls_recover_buf->rc_header.h_length;
|
|
left -= sizeof(struct dlm_rcom);
|
|
|
|
for (;;) {
|
|
__be16 v;
|
|
|
|
error = -EINVAL;
|
|
if (left < sizeof(__be16))
|
|
goto out_free;
|
|
|
|
memcpy(&v, b, sizeof(__be16));
|
|
namelen = be16_to_cpu(v);
|
|
b += sizeof(__be16);
|
|
left -= sizeof(__be16);
|
|
|
|
/* namelen of 0xFFFFF marks end of names for
|
|
this node; namelen of 0 marks end of the
|
|
buffer */
|
|
|
|
if (namelen == 0xFFFF)
|
|
goto done;
|
|
if (!namelen)
|
|
break;
|
|
|
|
if (namelen > left)
|
|
goto out_free;
|
|
|
|
if (namelen > DLM_RESNAME_MAXLEN)
|
|
goto out_free;
|
|
|
|
error = -ENOMEM;
|
|
de = get_free_de(ls, namelen);
|
|
if (!de)
|
|
goto out_free;
|
|
|
|
de->master_nodeid = memb->nodeid;
|
|
de->length = namelen;
|
|
last_len = namelen;
|
|
memcpy(de->name, b, namelen);
|
|
memcpy(last_name, b, namelen);
|
|
b += namelen;
|
|
left -= namelen;
|
|
|
|
add_entry_to_hash(ls, de);
|
|
count++;
|
|
}
|
|
}
|
|
done:
|
|
;
|
|
}
|
|
|
|
out_status:
|
|
error = 0;
|
|
dlm_set_recover_status(ls, DLM_RS_DIR);
|
|
log_debug(ls, "dlm_recover_directory %d entries", count);
|
|
out_free:
|
|
kfree(last_name);
|
|
out:
|
|
dlm_clear_free_entries(ls);
|
|
return error;
|
|
}
|
|
|
|
static int get_entry(struct dlm_ls *ls, int nodeid, char *name,
|
|
int namelen, int *r_nodeid)
|
|
{
|
|
struct dlm_direntry *de, *tmp;
|
|
uint32_t bucket;
|
|
|
|
bucket = dir_hash(ls, name, namelen);
|
|
|
|
write_lock(&ls->ls_dirtbl[bucket].lock);
|
|
de = search_bucket(ls, name, namelen, bucket);
|
|
if (de) {
|
|
*r_nodeid = de->master_nodeid;
|
|
write_unlock(&ls->ls_dirtbl[bucket].lock);
|
|
if (*r_nodeid == nodeid)
|
|
return -EEXIST;
|
|
return 0;
|
|
}
|
|
|
|
write_unlock(&ls->ls_dirtbl[bucket].lock);
|
|
|
|
if (namelen > DLM_RESNAME_MAXLEN)
|
|
return -EINVAL;
|
|
|
|
de = kzalloc(sizeof(struct dlm_direntry) + namelen, GFP_KERNEL);
|
|
if (!de)
|
|
return -ENOMEM;
|
|
|
|
de->master_nodeid = nodeid;
|
|
de->length = namelen;
|
|
memcpy(de->name, name, namelen);
|
|
|
|
write_lock(&ls->ls_dirtbl[bucket].lock);
|
|
tmp = search_bucket(ls, name, namelen, bucket);
|
|
if (tmp) {
|
|
kfree(de);
|
|
de = tmp;
|
|
} else {
|
|
list_add_tail(&de->list, &ls->ls_dirtbl[bucket].list);
|
|
}
|
|
*r_nodeid = de->master_nodeid;
|
|
write_unlock(&ls->ls_dirtbl[bucket].lock);
|
|
return 0;
|
|
}
|
|
|
|
int dlm_dir_lookup(struct dlm_ls *ls, int nodeid, char *name, int namelen,
|
|
int *r_nodeid)
|
|
{
|
|
return get_entry(ls, nodeid, name, namelen, r_nodeid);
|
|
}
|
|
|
|
static struct dlm_rsb *find_rsb_root(struct dlm_ls *ls, char *name, int len)
|
|
{
|
|
struct dlm_rsb *r;
|
|
|
|
down_read(&ls->ls_root_sem);
|
|
list_for_each_entry(r, &ls->ls_root_list, res_root_list) {
|
|
if (len == r->res_length && !memcmp(name, r->res_name, len)) {
|
|
up_read(&ls->ls_root_sem);
|
|
return r;
|
|
}
|
|
}
|
|
up_read(&ls->ls_root_sem);
|
|
return NULL;
|
|
}
|
|
|
|
/* Find the rsb where we left off (or start again), then send rsb names
|
|
for rsb's we're master of and whose directory node matches the requesting
|
|
node. inbuf is the rsb name last sent, inlen is the name's length */
|
|
|
|
void dlm_copy_master_names(struct dlm_ls *ls, char *inbuf, int inlen,
|
|
char *outbuf, int outlen, int nodeid)
|
|
{
|
|
struct list_head *list;
|
|
struct dlm_rsb *r;
|
|
int offset = 0, dir_nodeid;
|
|
__be16 be_namelen;
|
|
|
|
down_read(&ls->ls_root_sem);
|
|
|
|
if (inlen > 1) {
|
|
r = find_rsb_root(ls, inbuf, inlen);
|
|
if (!r) {
|
|
inbuf[inlen - 1] = '\0';
|
|
log_error(ls, "copy_master_names from %d start %d %s",
|
|
nodeid, inlen, inbuf);
|
|
goto out;
|
|
}
|
|
list = r->res_root_list.next;
|
|
} else {
|
|
list = ls->ls_root_list.next;
|
|
}
|
|
|
|
for (offset = 0; list != &ls->ls_root_list; list = list->next) {
|
|
r = list_entry(list, struct dlm_rsb, res_root_list);
|
|
if (r->res_nodeid)
|
|
continue;
|
|
|
|
dir_nodeid = dlm_dir_nodeid(r);
|
|
if (dir_nodeid != nodeid)
|
|
continue;
|
|
|
|
/*
|
|
* The block ends when we can't fit the following in the
|
|
* remaining buffer space:
|
|
* namelen (uint16_t) +
|
|
* name (r->res_length) +
|
|
* end-of-block record 0x0000 (uint16_t)
|
|
*/
|
|
|
|
if (offset + sizeof(uint16_t)*2 + r->res_length > outlen) {
|
|
/* Write end-of-block record */
|
|
be_namelen = cpu_to_be16(0);
|
|
memcpy(outbuf + offset, &be_namelen, sizeof(__be16));
|
|
offset += sizeof(__be16);
|
|
goto out;
|
|
}
|
|
|
|
be_namelen = cpu_to_be16(r->res_length);
|
|
memcpy(outbuf + offset, &be_namelen, sizeof(__be16));
|
|
offset += sizeof(__be16);
|
|
memcpy(outbuf + offset, r->res_name, r->res_length);
|
|
offset += r->res_length;
|
|
}
|
|
|
|
/*
|
|
* If we've reached the end of the list (and there's room) write a
|
|
* terminating record.
|
|
*/
|
|
|
|
if ((list == &ls->ls_root_list) &&
|
|
(offset + sizeof(uint16_t) <= outlen)) {
|
|
be_namelen = cpu_to_be16(0xFFFF);
|
|
memcpy(outbuf + offset, &be_namelen, sizeof(__be16));
|
|
offset += sizeof(__be16);
|
|
}
|
|
|
|
out:
|
|
up_read(&ls->ls_root_sem);
|
|
}
|
|
|