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292 lines
7.4 KiB
292 lines
7.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* AFS vlserver probing |
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* |
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* Copyright (C) 2018 Red Hat, Inc. All Rights Reserved. |
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* Written by David Howells ([email protected]) |
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*/ |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include "afs_fs.h" |
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#include "internal.h" |
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#include "protocol_yfs.h" |
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/* |
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* Handle the completion of a set of probes. |
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*/ |
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static void afs_finished_vl_probe(struct afs_vlserver *server) |
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{ |
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if (!(server->probe.flags & AFS_VLSERVER_PROBE_RESPONDED)) { |
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server->rtt = UINT_MAX; |
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clear_bit(AFS_VLSERVER_FL_RESPONDING, &server->flags); |
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} |
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clear_bit_unlock(AFS_VLSERVER_FL_PROBING, &server->flags); |
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wake_up_bit(&server->flags, AFS_VLSERVER_FL_PROBING); |
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} |
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/* |
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* Handle the completion of a probe RPC call. |
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*/ |
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static void afs_done_one_vl_probe(struct afs_vlserver *server, bool wake_up) |
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{ |
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if (atomic_dec_and_test(&server->probe_outstanding)) { |
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afs_finished_vl_probe(server); |
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wake_up = true; |
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} |
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if (wake_up) |
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wake_up_all(&server->probe_wq); |
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} |
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/* |
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* Process the result of probing a vlserver. This is called after successful |
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* or failed delivery of an VL.GetCapabilities operation. |
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*/ |
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void afs_vlserver_probe_result(struct afs_call *call) |
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{ |
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struct afs_addr_list *alist = call->alist; |
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struct afs_vlserver *server = call->vlserver; |
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unsigned int server_index = call->server_index; |
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unsigned int rtt_us = 0; |
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unsigned int index = call->addr_ix; |
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bool have_result = false; |
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int ret = call->error; |
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_enter("%s,%u,%u,%d,%d", server->name, server_index, index, ret, call->abort_code); |
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spin_lock(&server->probe_lock); |
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switch (ret) { |
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case 0: |
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server->probe.error = 0; |
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goto responded; |
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case -ECONNABORTED: |
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if (!(server->probe.flags & AFS_VLSERVER_PROBE_RESPONDED)) { |
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server->probe.abort_code = call->abort_code; |
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server->probe.error = ret; |
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} |
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goto responded; |
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case -ENOMEM: |
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case -ENONET: |
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case -EKEYEXPIRED: |
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case -EKEYREVOKED: |
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case -EKEYREJECTED: |
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server->probe.flags |= AFS_VLSERVER_PROBE_LOCAL_FAILURE; |
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if (server->probe.error == 0) |
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server->probe.error = ret; |
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trace_afs_io_error(call->debug_id, ret, afs_io_error_vl_probe_fail); |
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goto out; |
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case -ECONNRESET: /* Responded, but call expired. */ |
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case -ERFKILL: |
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case -EADDRNOTAVAIL: |
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case -ENETUNREACH: |
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case -EHOSTUNREACH: |
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case -EHOSTDOWN: |
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case -ECONNREFUSED: |
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case -ETIMEDOUT: |
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case -ETIME: |
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default: |
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clear_bit(index, &alist->responded); |
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set_bit(index, &alist->failed); |
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if (!(server->probe.flags & AFS_VLSERVER_PROBE_RESPONDED) && |
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(server->probe.error == 0 || |
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server->probe.error == -ETIMEDOUT || |
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server->probe.error == -ETIME)) |
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server->probe.error = ret; |
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trace_afs_io_error(call->debug_id, ret, afs_io_error_vl_probe_fail); |
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goto out; |
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} |
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responded: |
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set_bit(index, &alist->responded); |
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clear_bit(index, &alist->failed); |
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if (call->service_id == YFS_VL_SERVICE) { |
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server->probe.flags |= AFS_VLSERVER_PROBE_IS_YFS; |
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set_bit(AFS_VLSERVER_FL_IS_YFS, &server->flags); |
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alist->addrs[index].srx_service = call->service_id; |
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} else { |
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server->probe.flags |= AFS_VLSERVER_PROBE_NOT_YFS; |
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if (!(server->probe.flags & AFS_VLSERVER_PROBE_IS_YFS)) { |
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clear_bit(AFS_VLSERVER_FL_IS_YFS, &server->flags); |
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alist->addrs[index].srx_service = call->service_id; |
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} |
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} |
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if (rxrpc_kernel_get_srtt(call->net->socket, call->rxcall, &rtt_us) && |
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rtt_us < server->probe.rtt) { |
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server->probe.rtt = rtt_us; |
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server->rtt = rtt_us; |
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alist->preferred = index; |
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} |
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smp_wmb(); /* Set rtt before responded. */ |
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server->probe.flags |= AFS_VLSERVER_PROBE_RESPONDED; |
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set_bit(AFS_VLSERVER_FL_PROBED, &server->flags); |
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set_bit(AFS_VLSERVER_FL_RESPONDING, &server->flags); |
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have_result = true; |
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out: |
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spin_unlock(&server->probe_lock); |
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_debug("probe [%u][%u] %pISpc rtt=%u ret=%d", |
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server_index, index, &alist->addrs[index].transport, rtt_us, ret); |
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afs_done_one_vl_probe(server, have_result); |
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} |
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/* |
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* Probe all of a vlserver's addresses to find out the best route and to |
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* query its capabilities. |
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*/ |
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static bool afs_do_probe_vlserver(struct afs_net *net, |
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struct afs_vlserver *server, |
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struct key *key, |
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unsigned int server_index, |
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struct afs_error *_e) |
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{ |
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struct afs_addr_cursor ac = { |
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.index = 0, |
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}; |
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struct afs_call *call; |
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bool in_progress = false; |
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_enter("%s", server->name); |
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read_lock(&server->lock); |
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ac.alist = rcu_dereference_protected(server->addresses, |
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lockdep_is_held(&server->lock)); |
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read_unlock(&server->lock); |
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atomic_set(&server->probe_outstanding, ac.alist->nr_addrs); |
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memset(&server->probe, 0, sizeof(server->probe)); |
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server->probe.rtt = UINT_MAX; |
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for (ac.index = 0; ac.index < ac.alist->nr_addrs; ac.index++) { |
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call = afs_vl_get_capabilities(net, &ac, key, server, |
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server_index); |
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if (!IS_ERR(call)) { |
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afs_put_call(call); |
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in_progress = true; |
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} else { |
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afs_prioritise_error(_e, PTR_ERR(call), ac.abort_code); |
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afs_done_one_vl_probe(server, false); |
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} |
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} |
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return in_progress; |
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} |
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/* |
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* Send off probes to all unprobed servers. |
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*/ |
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int afs_send_vl_probes(struct afs_net *net, struct key *key, |
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struct afs_vlserver_list *vllist) |
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{ |
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struct afs_vlserver *server; |
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struct afs_error e; |
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bool in_progress = false; |
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int i; |
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e.error = 0; |
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e.responded = false; |
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for (i = 0; i < vllist->nr_servers; i++) { |
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server = vllist->servers[i].server; |
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if (test_bit(AFS_VLSERVER_FL_PROBED, &server->flags)) |
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continue; |
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if (!test_and_set_bit_lock(AFS_VLSERVER_FL_PROBING, &server->flags) && |
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afs_do_probe_vlserver(net, server, key, i, &e)) |
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in_progress = true; |
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} |
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return in_progress ? 0 : e.error; |
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} |
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/* |
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* Wait for the first as-yet untried server to respond. |
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*/ |
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int afs_wait_for_vl_probes(struct afs_vlserver_list *vllist, |
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unsigned long untried) |
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{ |
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struct wait_queue_entry *waits; |
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struct afs_vlserver *server; |
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unsigned int rtt = UINT_MAX, rtt_s; |
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bool have_responders = false; |
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int pref = -1, i; |
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_enter("%u,%lx", vllist->nr_servers, untried); |
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/* Only wait for servers that have a probe outstanding. */ |
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for (i = 0; i < vllist->nr_servers; i++) { |
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if (test_bit(i, &untried)) { |
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server = vllist->servers[i].server; |
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if (!test_bit(AFS_VLSERVER_FL_PROBING, &server->flags)) |
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__clear_bit(i, &untried); |
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if (server->probe.flags & AFS_VLSERVER_PROBE_RESPONDED) |
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have_responders = true; |
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} |
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} |
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if (have_responders || !untried) |
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return 0; |
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waits = kmalloc(array_size(vllist->nr_servers, sizeof(*waits)), GFP_KERNEL); |
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if (!waits) |
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return -ENOMEM; |
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for (i = 0; i < vllist->nr_servers; i++) { |
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if (test_bit(i, &untried)) { |
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server = vllist->servers[i].server; |
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init_waitqueue_entry(&waits[i], current); |
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add_wait_queue(&server->probe_wq, &waits[i]); |
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} |
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} |
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for (;;) { |
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bool still_probing = false; |
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set_current_state(TASK_INTERRUPTIBLE); |
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for (i = 0; i < vllist->nr_servers; i++) { |
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if (test_bit(i, &untried)) { |
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server = vllist->servers[i].server; |
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if (server->probe.flags & AFS_VLSERVER_PROBE_RESPONDED) |
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goto stop; |
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if (test_bit(AFS_VLSERVER_FL_PROBING, &server->flags)) |
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still_probing = true; |
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} |
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} |
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if (!still_probing || signal_pending(current)) |
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goto stop; |
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schedule(); |
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} |
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stop: |
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set_current_state(TASK_RUNNING); |
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for (i = 0; i < vllist->nr_servers; i++) { |
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if (test_bit(i, &untried)) { |
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server = vllist->servers[i].server; |
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rtt_s = READ_ONCE(server->rtt); |
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if (test_bit(AFS_VLSERVER_FL_RESPONDING, &server->flags) && |
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rtt_s < rtt) { |
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pref = i; |
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rtt = rtt_s; |
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} |
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remove_wait_queue(&server->probe_wq, &waits[i]); |
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} |
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} |
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kfree(waits); |
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if (pref == -1 && signal_pending(current)) |
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return -ERESTARTSYS; |
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if (pref >= 0) |
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vllist->preferred = pref; |
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_leave(" = 0 [%u]", pref); |
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return 0; |
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}
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