1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2004, 2005 Cluster File Systems, Inc.
6 * Author: Lai Siyao <lsy@clusterfs.com>
8 * This file is part of Lustre, http://www.lustre.org.
10 * Lustre is free software; you can redistribute it and/or
11 * modify it under the terms of version 2 of the GNU General Public
12 * License as published by the Free Software Foundation.
14 * Lustre is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with Lustre; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #define DEBUG_SUBSYSTEM S_LLITE
27 #include <linux/version.h>
28 #include <asm/uaccess.h>
29 #include <linux/file.h>
30 #include <linux/kmod.h>
32 #include <linux/lustre_lite.h>
33 #include "llite_internal.h"
35 static struct list_head *ll_capa_list = &capa_list[CLIENT_CAPA];
36 static struct ptlrpc_thread capa_thread;
38 static struct thread_ctl {
39 struct completion ctl_starting;
40 struct completion ctl_finishing;
43 static inline int have_expired_capa(void)
45 struct obd_capa *ocapa;
46 struct lustre_capa *capa;
54 spin_lock(&capa_lock);
55 if (!list_empty(ll_capa_list)) {
56 ocapa = list_entry(ll_capa_list->next, struct obd_capa, c_list);
57 expired = __capa_is_to_expire(ocapa, &tv);
59 capa = &ocapa->c_capa;
60 expiry = expiry_to_jiffies(capa->lc_expiry -
61 capa_pre_expiry(capa));
62 if (time_before(expiry, ll_capa_timer.expires) ||
63 !timer_pending(&ll_capa_timer)) {
64 mod_timer(&ll_capa_timer, expiry);
65 CDEBUG(D_INFO,"ll_capa_timer new expiry: %lu\n",
70 spin_unlock(&capa_lock);
75 static int inline ll_capa_check_stop(void)
77 return (capa_thread.t_flags & SVC_STOPPING) ? 1: 0;
80 static int ll_renew_capa(struct obd_capa *ocapa)
82 struct ptlrpc_request *req = NULL;
83 /* no need to lock, no one else will touch it */
84 struct inode *inode = ocapa->c_inode;
85 struct obd_export *md_exp = ll_i2mdexp(inode);
86 struct ll_inode_info *lli = ll_i2info(inode);
87 __u64 valid = OBD_MD_CAPA;
91 if (capa_expired(&ocapa->c_capa))
94 rc = md_getattr(md_exp, &lli->lli_id, valid, NULL, NULL, 0,
99 static int ll_capa_thread(void *arg)
101 struct thread_ctl *ctl = arg;
107 char name[sizeof(current->comm)];
108 snprintf(name, sizeof(name) - 1, "ll_capa");
109 kportal_daemonize(name);
112 SIGNAL_MASK_LOCK(current, flags);
113 sigfillset(¤t->blocked);
115 SIGNAL_MASK_UNLOCK(current, flags);
118 * letting starting function know, that we are ready and control may be
121 capa_thread.t_flags = SVC_RUNNING;
122 complete(&ctl->ctl_starting);
125 struct l_wait_info lwi = { 0 };
126 struct obd_capa *ocapa, tcapa, *tmp, *next = NULL;
127 unsigned long expiry, sleep = CAPA_PRE_EXPIRY;
131 l_wait_event(capa_thread.t_ctl_waitq,
132 (have_expired_capa() || ll_capa_check_stop()),
135 if (ll_capa_check_stop())
138 do_gettimeofday(&tv);
139 spin_lock(&capa_lock);
140 list_for_each_entry_safe(ocapa, tmp, ll_capa_list, c_list) {
141 if (ocapa->c_capa.lc_flags & CAPA_FL_SHORT)
142 sleep = CAPA_PRE_EXPIRY_SHORT;
144 if (ocapa->c_capa.lc_op == CAPA_TRUNC)
147 if (__capa_is_to_expire(ocapa, &tv)) {
148 inode = igrab(ocapa->c_inode);
153 spin_unlock(&capa_lock);
155 rc = ll_renew_capa(&tcapa);
161 spin_lock(&capa_lock);
169 struct lustre_capa *capa = &next->c_capa;
171 expiry = expiry_to_jiffies(capa->lc_expiry -
172 capa_pre_expiry(capa));
173 if (time_before(expiry, ll_capa_timer.expires) ||
174 !timer_pending(&ll_capa_timer)) {
175 mod_timer(&ll_capa_timer, expiry);
176 CDEBUG(D_INFO,"ll_capa_timer new expiry: %lu\n",
180 spin_unlock(&capa_lock);
182 /* wait ll_renew_capa finish */
183 set_current_state(TASK_INTERRUPTIBLE);
184 schedule_timeout(sleep * HZ);
187 capa_thread.t_flags = SVC_STOPPED;
189 /* this is SMP-safe way to finish thread. */
190 complete_and_exit(&ctl->ctl_finishing, 0);
194 /* just wake up, others are handled by ll_capa_thread */
195 void ll_capa_timer_callback(unsigned long unused)
198 wake_up(&capa_thread.t_ctl_waitq);
202 int ll_capa_thread_start(void)
207 LASSERT(capa_thread.t_flags == 0);
208 init_completion(&ll_capa_ctl.ctl_starting);
209 init_completion(&ll_capa_ctl.ctl_finishing);
210 init_waitqueue_head(&capa_thread.t_ctl_waitq);
212 rc = kernel_thread(ll_capa_thread, &ll_capa_ctl,
213 (CLONE_VM | CLONE_FILES));
215 CERROR("cannot start expired capa thread, "
219 wait_for_completion(&ll_capa_ctl.ctl_starting);
220 LASSERT(capa_thread.t_flags == SVC_RUNNING);
224 void ll_capa_thread_stop(void)
228 capa_thread.t_flags = SVC_STOPPING;
229 wake_up(&capa_thread.t_ctl_waitq);
230 wait_for_completion(&ll_capa_ctl.ctl_finishing);
231 LASSERT(capa_thread.t_flags == SVC_STOPPED);
232 capa_thread.t_flags = 0;
237 int ll_set_capa(struct inode *inode, struct lookup_intent *it,
238 struct obd_client_handle *och)
240 struct ptlrpc_request *req = LUSTRE_IT(it)->it_data;
241 struct mds_body *body;
242 struct lustre_capa *capa;
243 struct obd_capa *ocapa;
244 struct ll_inode_info *lli = ll_i2info(inode);
245 unsigned long expiry;
247 if (!S_ISREG(inode->i_mode))
250 /* GNS code path will have no req */
254 body = lustre_msg_buf(req->rq_repmsg, 1, sizeof (*body));
255 LASSERT(body != NULL); /* reply already checked out */
256 LASSERT_REPSWABBED(req, 1); /* and swabbed down */
258 if (!(body->valid & OBD_MD_CAPA))
263 capa = lustre_msg_buf(req->rq_repmsg, 7, sizeof (*capa));
264 LASSERT(capa != NULL); /* reply already checked out */
265 LASSERT_REPSWABBED(req, 7); /* and swabbed down */
267 ocapa = capa_renew(capa, CLIENT_CAPA);
271 spin_lock(&capa_lock);
272 ocapa->c_inode = inode;
273 ocapa->c_handle = och->och_fh;
274 spin_unlock(&capa_lock);
276 spin_lock(&lli->lli_lock);
277 /* in case it was linked to lli_capas already */
278 if (list_empty(&ocapa->c_lli_list))
279 list_add(&ocapa->c_lli_list, &lli->lli_capas);
280 spin_unlock(&lli->lli_lock);
284 expiry = expiry_to_jiffies(capa->lc_expiry - capa_pre_expiry(capa));
286 spin_lock(&capa_lock);
287 if (time_before(expiry, ll_capa_timer.expires) ||
288 !timer_pending(&ll_capa_timer)) {
289 mod_timer(&ll_capa_timer, expiry);
290 CDEBUG(D_INFO, "ll_capa_timer new expiry: %lu\n", expiry);
292 spin_unlock(&capa_lock);
297 int ll_set_trunc_capa(struct ptlrpc_request *req, int offset, struct inode *inode)
299 struct mds_body *body;
300 struct obd_capa *ocapa;
301 struct lustre_capa *capa;
302 struct ll_inode_info *lli = ll_i2info(inode);
304 body = lustre_msg_buf(req->rq_repmsg, offset, sizeof(*body));
308 if (!(body->valid & OBD_MD_CAPA))
312 capa = (struct lustre_capa *)lustre_swab_repbuf(req, offset + 1,
313 sizeof(*capa), lustre_swab_lustre_capa);
317 ocapa = capa_renew(capa, CLIENT_CAPA);
321 spin_lock(&lli->lli_lock);
322 /* in case it was linked to lli_capas already */
323 if (list_empty(&ocapa->c_lli_list))
324 list_add(&ocapa->c_lli_list, &lli->lli_capas);
325 spin_unlock(&lli->lli_lock);
330 struct obd_capa *ll_get_capa(struct inode *inode, uid_t uid, int op)
332 struct ll_inode_info *lli = ll_i2info(inode);
333 struct obd_capa *ocapa, *tmp;
336 list_for_each_entry_safe(ocapa, tmp, &lli->lli_capas, c_lli_list) {
337 if (ocapa->c_capa.lc_ruid != uid)
339 if (ocapa->c_capa.lc_op != op)