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27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
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33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/ptlrpc/sec_gc.c
38 * Author: Eric Mei <ericm@clusterfs.com>
41 #define DEBUG_SUBSYSTEM S_SEC
43 #include <libcfs/libcfs.h>
45 #include <obd_support.h>
46 #include <obd_class.h>
47 #include <lustre_net.h>
48 #include <lustre_sec.h>
50 #include "ptlrpc_internal.h"
52 #define SEC_GC_INTERVAL (30 * 60)
55 static struct mutex sec_gc_mutex;
56 static spinlock_t sec_gc_list_lock;
57 static struct list_head sec_gc_list;
59 static spinlock_t sec_gc_ctx_list_lock;
60 static struct list_head sec_gc_ctx_list;
62 static struct ptlrpc_thread sec_gc_thread;
63 static atomic_t sec_gc_wait_del = ATOMIC_INIT(0);
66 void sptlrpc_gc_add_sec(struct ptlrpc_sec *sec)
68 LASSERT(sec->ps_policy->sp_cops->gc_ctx);
69 LASSERT(sec->ps_gc_interval > 0);
70 LASSERT(list_empty(&sec->ps_gc_list));
72 sec->ps_gc_next = cfs_time_current_sec() + sec->ps_gc_interval;
74 spin_lock(&sec_gc_list_lock);
75 list_add_tail(&sec_gc_list, &sec->ps_gc_list);
76 spin_unlock(&sec_gc_list_lock);
78 CDEBUG(D_SEC, "added sec %p(%s)\n", sec, sec->ps_policy->sp_name);
81 void sptlrpc_gc_del_sec(struct ptlrpc_sec *sec)
83 if (list_empty(&sec->ps_gc_list))
88 /* signal before list_del to make iteration in gc thread safe */
89 atomic_inc(&sec_gc_wait_del);
91 spin_lock(&sec_gc_list_lock);
92 list_del_init(&sec->ps_gc_list);
93 spin_unlock(&sec_gc_list_lock);
96 mutex_lock(&sec_gc_mutex);
97 mutex_unlock(&sec_gc_mutex);
99 atomic_dec(&sec_gc_wait_del);
101 CDEBUG(D_SEC, "del sec %p(%s)\n", sec, sec->ps_policy->sp_name);
104 void sptlrpc_gc_add_ctx(struct ptlrpc_cli_ctx *ctx)
106 LASSERT(list_empty(&ctx->cc_gc_chain));
108 CDEBUG(D_SEC, "hand over ctx %p(%u->%s)\n",
109 ctx, ctx->cc_vcred.vc_uid, sec2target_str(ctx->cc_sec));
110 spin_lock(&sec_gc_ctx_list_lock);
111 list_add(&ctx->cc_gc_chain, &sec_gc_ctx_list);
112 spin_unlock(&sec_gc_ctx_list_lock);
114 thread_add_flags(&sec_gc_thread, SVC_SIGNAL);
115 wake_up(&sec_gc_thread.t_ctl_waitq);
117 EXPORT_SYMBOL(sptlrpc_gc_add_ctx);
119 static void sec_process_ctx_list(void)
121 struct ptlrpc_cli_ctx *ctx;
123 spin_lock(&sec_gc_ctx_list_lock);
125 while (!list_empty(&sec_gc_ctx_list)) {
126 ctx = list_entry(sec_gc_ctx_list.next,
127 struct ptlrpc_cli_ctx, cc_gc_chain);
128 list_del_init(&ctx->cc_gc_chain);
129 spin_unlock(&sec_gc_ctx_list_lock);
131 LASSERT(ctx->cc_sec);
132 LASSERT(atomic_read(&ctx->cc_refcount) == 1);
133 CDEBUG(D_SEC, "gc pick up ctx %p(%u->%s)\n",
134 ctx, ctx->cc_vcred.vc_uid, sec2target_str(ctx->cc_sec));
135 sptlrpc_cli_ctx_put(ctx, 1);
137 spin_lock(&sec_gc_ctx_list_lock);
140 spin_unlock(&sec_gc_ctx_list_lock);
143 static void sec_do_gc(struct ptlrpc_sec *sec)
145 LASSERT(sec->ps_policy->sp_cops->gc_ctx);
147 if (unlikely(sec->ps_gc_next == 0)) {
148 CDEBUG(D_SEC, "sec %p(%s) has 0 gc time\n",
149 sec, sec->ps_policy->sp_name);
153 CDEBUG(D_SEC, "check on sec %p(%s)\n", sec, sec->ps_policy->sp_name);
155 if (cfs_time_after(sec->ps_gc_next, cfs_time_current_sec()))
158 sec->ps_policy->sp_cops->gc_ctx(sec);
159 sec->ps_gc_next = cfs_time_current_sec() + sec->ps_gc_interval;
162 static int sec_gc_main(void *arg)
164 struct ptlrpc_thread *thread = (struct ptlrpc_thread *) arg;
165 struct l_wait_info lwi;
169 /* Record that the thread is running */
170 thread_set_flags(thread, SVC_RUNNING);
171 wake_up(&thread->t_ctl_waitq);
174 struct ptlrpc_sec *sec;
176 thread_clear_flags(thread, SVC_SIGNAL);
177 sec_process_ctx_list();
179 /* go through sec list do gc.
180 * FIXME here we iterate through the whole list each time which
181 * is not optimal. we perhaps want to use balanced binary tree
182 * to trace each sec as order of expiry time.
183 * another issue here is we wakeup as fixed interval instead of
184 * according to each sec's expiry time */
185 mutex_lock(&sec_gc_mutex);
186 list_for_each_entry(sec, &sec_gc_list, ps_gc_list) {
187 /* if someone is waiting to be deleted, let it
188 * proceed as soon as possible. */
189 if (atomic_read(&sec_gc_wait_del)) {
190 CDEBUG(D_SEC, "deletion pending, start over\n");
191 mutex_unlock(&sec_gc_mutex);
197 mutex_unlock(&sec_gc_mutex);
199 /* check ctx list again before sleep */
200 sec_process_ctx_list();
202 lwi = LWI_TIMEOUT(msecs_to_jiffies(SEC_GC_INTERVAL *
205 l_wait_event(thread->t_ctl_waitq,
206 thread_is_stopping(thread) ||
207 thread_is_signal(thread),
210 if (thread_test_and_clear_flags(thread, SVC_STOPPING))
214 thread_set_flags(thread, SVC_STOPPED);
215 wake_up(&thread->t_ctl_waitq);
219 int sptlrpc_gc_init(void)
221 struct l_wait_info lwi = { 0 };
222 struct task_struct *task;
224 mutex_init(&sec_gc_mutex);
225 spin_lock_init(&sec_gc_list_lock);
226 spin_lock_init(&sec_gc_ctx_list_lock);
228 INIT_LIST_HEAD(&sec_gc_list);
229 INIT_LIST_HEAD(&sec_gc_ctx_list);
231 /* initialize thread control */
232 memset(&sec_gc_thread, 0, sizeof(sec_gc_thread));
233 init_waitqueue_head(&sec_gc_thread.t_ctl_waitq);
235 task = kthread_run(sec_gc_main, &sec_gc_thread, "sptlrpc_gc");
237 CERROR("can't start gc thread: %ld\n", PTR_ERR(task));
238 return PTR_ERR(task);
241 l_wait_event(sec_gc_thread.t_ctl_waitq,
242 thread_is_running(&sec_gc_thread), &lwi);
246 void sptlrpc_gc_fini(void)
248 struct l_wait_info lwi = { 0 };
250 thread_set_flags(&sec_gc_thread, SVC_STOPPING);
251 wake_up(&sec_gc_thread.t_ctl_waitq);
253 l_wait_event(sec_gc_thread.t_ctl_waitq,
254 thread_is_stopped(&sec_gc_thread), &lwi);