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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
152 lines
3.3 KiB
C
152 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* AFS fileserver list management.
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*
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* Copyright (C) 2017 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include "internal.h"
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void afs_put_serverlist(struct afs_net *net, struct afs_server_list *slist)
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{
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int i;
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if (slist && refcount_dec_and_test(&slist->usage)) {
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for (i = 0; i < slist->nr_servers; i++) {
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afs_put_cb_interest(net, slist->servers[i].cb_interest);
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afs_put_server(net, slist->servers[i].server);
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}
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kfree(slist);
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}
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}
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/*
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* Build a server list from a VLDB record.
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*/
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struct afs_server_list *afs_alloc_server_list(struct afs_cell *cell,
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struct key *key,
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struct afs_vldb_entry *vldb,
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u8 type_mask)
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{
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struct afs_server_list *slist;
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struct afs_server *server;
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int ret = -ENOMEM, nr_servers = 0, i, j;
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for (i = 0; i < vldb->nr_servers; i++)
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if (vldb->fs_mask[i] & type_mask)
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nr_servers++;
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slist = kzalloc(struct_size(slist, servers, nr_servers), GFP_KERNEL);
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if (!slist)
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goto error;
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refcount_set(&slist->usage, 1);
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rwlock_init(&slist->lock);
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/* Make sure a records exists for each server in the list. */
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for (i = 0; i < vldb->nr_servers; i++) {
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if (!(vldb->fs_mask[i] & type_mask))
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continue;
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server = afs_lookup_server(cell, key, &vldb->fs_server[i]);
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if (IS_ERR(server)) {
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ret = PTR_ERR(server);
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if (ret == -ENOENT ||
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ret == -ENOMEDIUM)
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continue;
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goto error_2;
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}
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/* Insertion-sort by UUID */
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for (j = 0; j < slist->nr_servers; j++)
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if (memcmp(&slist->servers[j].server->uuid,
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&server->uuid,
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sizeof(server->uuid)) >= 0)
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break;
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if (j < slist->nr_servers) {
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if (slist->servers[j].server == server) {
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afs_put_server(cell->net, server);
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continue;
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}
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memmove(slist->servers + j + 1,
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slist->servers + j,
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(slist->nr_servers - j) * sizeof(struct afs_server_entry));
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}
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slist->servers[j].server = server;
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slist->nr_servers++;
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}
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if (slist->nr_servers == 0) {
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ret = -EDESTADDRREQ;
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goto error_2;
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}
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return slist;
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error_2:
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afs_put_serverlist(cell->net, slist);
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error:
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return ERR_PTR(ret);
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}
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/*
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* Copy the annotations from an old server list to its potential replacement.
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*/
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bool afs_annotate_server_list(struct afs_server_list *new,
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struct afs_server_list *old)
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{
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struct afs_server *cur;
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int i, j;
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if (old->nr_servers != new->nr_servers)
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goto changed;
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for (i = 0; i < old->nr_servers; i++)
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if (old->servers[i].server != new->servers[i].server)
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goto changed;
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return false;
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changed:
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/* Maintain the same preferred server as before if possible. */
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cur = old->servers[old->preferred].server;
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for (j = 0; j < new->nr_servers; j++) {
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if (new->servers[j].server == cur) {
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new->preferred = j;
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break;
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}
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}
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/* Keep the old callback interest records where possible so that we
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* maintain callback interception.
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*/
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i = 0;
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j = 0;
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while (i < old->nr_servers && j < new->nr_servers) {
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if (new->servers[j].server == old->servers[i].server) {
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struct afs_cb_interest *cbi = old->servers[i].cb_interest;
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if (cbi) {
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new->servers[j].cb_interest = cbi;
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refcount_inc(&cbi->usage);
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}
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i++;
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j++;
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continue;
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}
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if (new->servers[j].server < old->servers[i].server) {
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j++;
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continue;
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}
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i++;
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continue;
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}
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return true;
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}
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