155 lines
3.5 KiB
C
155 lines
3.5 KiB
C
/* AFS fileserver list management.
|
|
*
|
|
* Copyright (C) 2017 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include "internal.h"
|
|
|
|
void afs_put_serverlist(struct afs_net *net, struct afs_server_list *slist)
|
|
{
|
|
int i;
|
|
|
|
if (slist && refcount_dec_and_test(&slist->usage)) {
|
|
for (i = 0; i < slist->nr_servers; i++) {
|
|
afs_put_cb_interest(net, slist->servers[i].cb_interest);
|
|
afs_put_server(net, slist->servers[i].server);
|
|
}
|
|
kfree(slist);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Build a server list from a VLDB record.
|
|
*/
|
|
struct afs_server_list *afs_alloc_server_list(struct afs_cell *cell,
|
|
struct key *key,
|
|
struct afs_vldb_entry *vldb,
|
|
u8 type_mask)
|
|
{
|
|
struct afs_server_list *slist;
|
|
struct afs_server *server;
|
|
int ret = -ENOMEM, nr_servers = 0, i, j;
|
|
|
|
for (i = 0; i < vldb->nr_servers; i++)
|
|
if (vldb->fs_mask[i] & type_mask)
|
|
nr_servers++;
|
|
|
|
slist = kzalloc(sizeof(struct afs_server_list) +
|
|
sizeof(struct afs_server_entry) * nr_servers,
|
|
GFP_KERNEL);
|
|
if (!slist)
|
|
goto error;
|
|
|
|
refcount_set(&slist->usage, 1);
|
|
|
|
/* Make sure a records exists for each server in the list. */
|
|
for (i = 0; i < vldb->nr_servers; i++) {
|
|
if (!(vldb->fs_mask[i] & type_mask))
|
|
continue;
|
|
|
|
server = afs_lookup_server(cell, key, &vldb->fs_server[i]);
|
|
if (IS_ERR(server)) {
|
|
ret = PTR_ERR(server);
|
|
if (ret == -ENOENT ||
|
|
ret == -ENOMEDIUM)
|
|
continue;
|
|
goto error_2;
|
|
}
|
|
|
|
/* Insertion-sort by server pointer */
|
|
for (j = 0; j < slist->nr_servers; j++)
|
|
if (slist->servers[j].server >= server)
|
|
break;
|
|
if (j < slist->nr_servers) {
|
|
if (slist->servers[j].server == server) {
|
|
afs_put_server(cell->net, server);
|
|
continue;
|
|
}
|
|
|
|
memmove(slist->servers + j + 1,
|
|
slist->servers + j,
|
|
(slist->nr_servers - j) * sizeof(struct afs_server_entry));
|
|
}
|
|
|
|
slist->servers[j].server = server;
|
|
slist->nr_servers++;
|
|
}
|
|
|
|
if (slist->nr_servers == 0) {
|
|
ret = -EDESTADDRREQ;
|
|
goto error_2;
|
|
}
|
|
|
|
return slist;
|
|
|
|
error_2:
|
|
afs_put_serverlist(cell->net, slist);
|
|
error:
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/*
|
|
* Copy the annotations from an old server list to its potential replacement.
|
|
*/
|
|
bool afs_annotate_server_list(struct afs_server_list *new,
|
|
struct afs_server_list *old)
|
|
{
|
|
struct afs_server *cur;
|
|
int i, j;
|
|
|
|
if (old->nr_servers != new->nr_servers)
|
|
goto changed;
|
|
|
|
for (i = 0; i < old->nr_servers; i++)
|
|
if (old->servers[i].server != new->servers[i].server)
|
|
goto changed;
|
|
|
|
return false;
|
|
|
|
changed:
|
|
/* Maintain the same current server as before if possible. */
|
|
cur = old->servers[old->index].server;
|
|
for (j = 0; j < new->nr_servers; j++) {
|
|
if (new->servers[j].server == cur) {
|
|
new->index = j;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Keep the old callback interest records where possible so that we
|
|
* maintain callback interception.
|
|
*/
|
|
i = 0;
|
|
j = 0;
|
|
while (i < old->nr_servers && j < new->nr_servers) {
|
|
if (new->servers[j].server == old->servers[i].server) {
|
|
struct afs_cb_interest *cbi = old->servers[i].cb_interest;
|
|
if (cbi) {
|
|
new->servers[j].cb_interest = cbi;
|
|
refcount_inc(&cbi->usage);
|
|
}
|
|
i++;
|
|
j++;
|
|
continue;
|
|
}
|
|
|
|
if (new->servers[j].server < old->servers[i].server) {
|
|
j++;
|
|
continue;
|
|
}
|
|
|
|
i++;
|
|
continue;
|
|
}
|
|
|
|
return true;
|
|
}
|