-/*
- * GPL HEADER START
- *
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 only,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License version 2 for more details (a copy is included
- * in the LICENSE file that accompanied this code).
- *
- * You should have received a copy of the GNU General Public License
- * version 2 along with this program; If not, see
- * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
- *
- * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
- * CA 95054 USA or visit www.sun.com if you need additional information or
- * have any questions.
- *
- * GPL HEADER END
- */
-/*
- * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Use is subject to license terms.
- *
- * Copyright (c) 2012, 2014, Intel Corporation.
- */
-/*
- * This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
- *
- * lustre/llite/llite_capa.c
- *
- * Author: Lai Siyao <lsy@clusterfs.com>
- */
-
-#define DEBUG_SUBSYSTEM S_LLITE
-
-#include <linux/fs.h>
-#include <linux/version.h>
-#include <linux/kthread.h>
-#include <asm/uaccess.h>
-#include <linux/file.h>
-#include <linux/kmod.h>
-
-#include "llite_internal.h"
-
-/* for obd_capa.c_list, client capa might stay in three places:
- * 1. ll_capa_list.
- * 2. ll_idle_capas.
- * 3. stand alone: just allocated.
- */
-
-/* capas for oss writeback and those failed to renew */
-static struct list_head ll_idle_capas = LIST_HEAD_INIT(ll_idle_capas);
-static struct ptlrpc_thread ll_capa_thread;
-static struct list_head *ll_capa_list = &capa_list[CAPA_SITE_CLIENT];
-
-/* llite capa renewal timer */
-struct timer_list ll_capa_timer;
-/* for debug: indicate whether capa on llite is enabled or not */
-static atomic_t ll_capa_debug = ATOMIC_INIT(0);
-static unsigned long long ll_capa_renewed = 0;
-static unsigned long long ll_capa_renewal_noent = 0;
-static unsigned long long ll_capa_renewal_failed = 0;
-static unsigned long long ll_capa_renewal_retries = 0;
-
-static int ll_update_capa(struct obd_capa *ocapa, struct lustre_capa *capa);
-
-static inline void update_capa_timer(struct obd_capa *ocapa, cfs_time_t expiry)
-{
- if (cfs_time_before(expiry, ll_capa_timer.expires) ||
- !timer_pending(&ll_capa_timer)) {
- mod_timer(&ll_capa_timer, expiry);
- DEBUG_CAPA(D_SEC, &ocapa->c_capa,
- "ll_capa_timer update: %lu/%lu by", expiry, jiffies);
- }
-}
-
-static inline cfs_time_t capa_renewal_time(struct obd_capa *ocapa)
-{
- return cfs_time_sub(ocapa->c_expiry,
- cfs_time_seconds(ocapa->c_capa.lc_timeout) / 2);
-}
-
-static inline int capa_is_to_expire(struct obd_capa *ocapa)
-{
- return cfs_time_beforeq(capa_renewal_time(ocapa), cfs_time_current());
-}
-
-static inline int have_expired_capa(void)
-{
- struct obd_capa *ocapa = NULL;
- int expired = 0;
-
- /* if ll_capa_list has client capa to expire or ll_idle_capas has
- * expired capa, return 1.
- */
- spin_lock(&capa_lock);
- if (!list_empty(ll_capa_list)) {
- ocapa = list_entry(ll_capa_list->next, struct obd_capa,
- c_list);
- expired = capa_is_to_expire(ocapa);
- if (!expired)
- update_capa_timer(ocapa, capa_renewal_time(ocapa));
- } else if (!list_empty(&ll_idle_capas)) {
- ocapa = list_entry(ll_idle_capas.next, struct obd_capa,
- c_list);
- expired = capa_is_expired(ocapa);
- if (!expired)
- update_capa_timer(ocapa, ocapa->c_expiry);
- }
- spin_unlock(&capa_lock);
-
- if (expired)
- DEBUG_CAPA(D_SEC, &ocapa->c_capa, "expired");
- return expired;
-}
-
-static void sort_add_capa(struct obd_capa *ocapa, struct list_head *head)
-{
- struct obd_capa *tmp;
- struct list_head *before = NULL;
-
- /* TODO: client capa is sorted by expiry, this could be optimized */
- list_for_each_entry_reverse(tmp, head, c_list) {
- if (cfs_time_aftereq(ocapa->c_expiry, tmp->c_expiry)) {
- before = &tmp->c_list;
- break;
- }
- }
-
- LASSERT(&ocapa->c_list != before);
- list_add(&ocapa->c_list, before ?: head);
-}
-
-static inline int obd_capa_open_count(struct obd_capa *oc)
-{
- struct ll_inode_info *lli = ll_i2info(oc->u.cli.inode);
- return atomic_read(&lli->lli_open_count);
-}
-
-static void ll_delete_capa(struct obd_capa *ocapa)
-{
- struct ll_inode_info *lli = ll_i2info(ocapa->u.cli.inode);
-
- if (capa_for_mds(&ocapa->c_capa)) {
- LASSERT(lli->lli_mds_capa == ocapa);
- lli->lli_mds_capa = NULL;
- } else if (capa_for_oss(&ocapa->c_capa)) {
- list_del_init(&ocapa->u.cli.lli_list);
- }
-
- DEBUG_CAPA(D_SEC, &ocapa->c_capa, "free client");
- list_del_init(&ocapa->c_list);
- capa_count[CAPA_SITE_CLIENT]--;
- /* release the ref when alloc */
- capa_put(ocapa);
-}
-
-/* three places where client capa is deleted:
- * 1. capa_thread_main(), main place to delete expired capa.
- * 2. ll_clear_inode_capas() in ll_clear_inode().
- * 3. ll_truncate_free_capa() delete truncate capa explicitly in ll_setattr_ost().
- */
-static int capa_thread_main(void *unused)
-{
- struct obd_capa *ocapa, *tmp, *next;
- struct inode *inode = NULL;
- struct l_wait_info lwi = { 0 };
- int rc;
- ENTRY;
-
- thread_set_flags(&ll_capa_thread, SVC_RUNNING);
- wake_up(&ll_capa_thread.t_ctl_waitq);
-
- while (1) {
- l_wait_event(ll_capa_thread.t_ctl_waitq,
- !thread_is_running(&ll_capa_thread) ||
- have_expired_capa(),
- &lwi);
-
- if (!thread_is_running(&ll_capa_thread))
- break;
-
- next = NULL;
-
- spin_lock(&capa_lock);
- list_for_each_entry_safe(ocapa, tmp, ll_capa_list, c_list) {
- __u64 ibits;
-
- LASSERT(ocapa->c_capa.lc_opc != CAPA_OPC_OSS_TRUNC);
-
- if (!capa_is_to_expire(ocapa)) {
- next = ocapa;
- break;
- }
-
- list_del_init(&ocapa->c_list);
-
- /* for MDS capability, only renew those which belong to
- * dir, or its inode is opened, or client holds LOOKUP
- * lock.
- */
- /* ibits may be changed by ll_have_md_lock() so we have
- * to set it each time */
- ibits = MDS_INODELOCK_LOOKUP;
- if (capa_for_mds(&ocapa->c_capa) &&
- !S_ISDIR(ocapa->u.cli.inode->i_mode) &&
- obd_capa_open_count(ocapa) == 0 &&
- !ll_have_md_lock(ocapa->u.cli.inode,
- &ibits, LCK_MINMODE)) {
- DEBUG_CAPA(D_SEC, &ocapa->c_capa,
- "skip renewal for");
- sort_add_capa(ocapa, &ll_idle_capas);
- continue;
- }
-
- /* for OSS capability, only renew those whose inode is
- * opened.
- */
- if (capa_for_oss(&ocapa->c_capa) &&
- obd_capa_open_count(ocapa) == 0) {
- /* oss capa with open count == 0 won't renew,
- * move to idle list */
- sort_add_capa(ocapa, &ll_idle_capas);
- continue;
- }
-
- /* NB iput() is in ll_update_capa() */
- inode = igrab(ocapa->u.cli.inode);
- if (inode == NULL) {
- DEBUG_CAPA(D_ERROR, &ocapa->c_capa,
- "igrab failed for");
- continue;
- }
-
- capa_get(ocapa);
- ll_capa_renewed++;
- spin_unlock(&capa_lock);
- rc = md_renew_capa(ll_i2mdexp(inode), ocapa,
- ll_update_capa);
- spin_lock(&capa_lock);
- if (rc) {
- DEBUG_CAPA(D_ERROR, &ocapa->c_capa,
- "renew failed: %d", rc);
- ll_capa_renewal_failed++;
- }
- }
-
- if (next)
- update_capa_timer(next, capa_renewal_time(next));
-
- list_for_each_entry_safe(ocapa, tmp, &ll_idle_capas,
- c_list) {
- if (!capa_is_expired(ocapa)) {
- if (!next)
- update_capa_timer(ocapa,
- ocapa->c_expiry);
- break;
- }
-
- if (atomic_read(&ocapa->c_refc) > 1) {
- DEBUG_CAPA(D_SEC, &ocapa->c_capa,
- "expired(c_refc %d), don't release",
- atomic_read(&ocapa->c_refc));
- /* don't try to renew any more */
- list_del_init(&ocapa->c_list);
- continue;
- }
-
- /* expired capa is released. */
- DEBUG_CAPA(D_SEC, &ocapa->c_capa, "release expired");
- ll_delete_capa(ocapa);
- }
-
- spin_unlock(&capa_lock);
- }
-
- thread_set_flags(&ll_capa_thread, SVC_STOPPED);
- wake_up(&ll_capa_thread.t_ctl_waitq);
- RETURN(0);
-}
-
-void ll_capa_timer_callback(unsigned long unused)
-{
- wake_up(&ll_capa_thread.t_ctl_waitq);
-}
-
-int ll_capa_thread_start(void)
-{
- struct task_struct *task;
- ENTRY;
-
- init_waitqueue_head(&ll_capa_thread.t_ctl_waitq);
-
- task = kthread_run(capa_thread_main, NULL, "ll_capa");
- if (IS_ERR(task)) {
- CERROR("cannot start expired capa thread: rc %ld\n",
- PTR_ERR(task));
- RETURN(PTR_ERR(task));
- }
- wait_event(ll_capa_thread.t_ctl_waitq,
- thread_is_running(&ll_capa_thread));
-
- RETURN(0);
-}
-
-void ll_capa_thread_stop(void)
-{
- thread_set_flags(&ll_capa_thread, SVC_STOPPING);
- wake_up(&ll_capa_thread.t_ctl_waitq);
- wait_event(ll_capa_thread.t_ctl_waitq,
- thread_is_stopped(&ll_capa_thread));
-}
-
-struct obd_capa *ll_mdscapa_get(struct inode *inode)
-{
- struct ll_inode_info *lli = ll_i2info(inode);
- struct obd_capa *ocapa;
- ENTRY;
-
- LASSERT(inode != NULL);
-
- if ((ll_i2sbi(inode)->ll_flags & LL_SBI_MDS_CAPA) == 0)
- RETURN(NULL);
-
- spin_lock(&capa_lock);
- ocapa = capa_get(lli->lli_mds_capa);
- spin_unlock(&capa_lock);
- if (!ocapa && atomic_read(&ll_capa_debug)) {
- CERROR("no mds capability for "DFID"\n", PFID(&lli->lli_fid));
- atomic_set(&ll_capa_debug, 0);
- }
-
- RETURN(ocapa);
-}
-
-static struct obd_capa *do_add_mds_capa(struct inode *inode,
- struct obd_capa *ocapa)
-{
- struct ll_inode_info *lli = ll_i2info(inode);
- struct obd_capa *old = lli->lli_mds_capa;
- struct lustre_capa *capa = &ocapa->c_capa;
-
- if (!old) {
- ocapa->u.cli.inode = inode;
- lli->lli_mds_capa = ocapa;
- capa_count[CAPA_SITE_CLIENT]++;
-
- DEBUG_CAPA(D_SEC, capa, "add MDS");
- } else {
- spin_lock(&old->c_lock);
- old->c_capa = *capa;
- spin_unlock(&old->c_lock);
-
- DEBUG_CAPA(D_SEC, capa, "update MDS");
-
- capa_put(ocapa);
- ocapa = old;
- }
- return ocapa;
-}
-
-static struct obd_capa *do_lookup_oss_capa(struct inode *inode, int opc)
-{
- struct ll_inode_info *lli = ll_i2info(inode);
- struct obd_capa *ocapa;
-
- /* inside capa_lock */
- list_for_each_entry(ocapa, &lli->lli_oss_capas, u.cli.lli_list) {
- if ((capa_opc(&ocapa->c_capa) & opc) != opc)
- continue;
-
- LASSERT(lu_fid_eq(capa_fid(&ocapa->c_capa),
- ll_inode2fid(inode)));
- LASSERT(ocapa->c_site == CAPA_SITE_CLIENT);
-
- DEBUG_CAPA(D_SEC, &ocapa->c_capa, "found client");
- return ocapa;
- }
-
- return NULL;
-}
-
-static inline void inode_add_oss_capa(struct inode *inode,
- struct obd_capa *ocapa)
-{
- struct ll_inode_info *lli = ll_i2info(inode);
- struct obd_capa *tmp;
- struct list_head *next = NULL;
-
- /* capa is sorted in lli_oss_capas so lookup can always find the
- * latest one */
- list_for_each_entry(tmp, &lli->lli_oss_capas, u.cli.lli_list) {
- if (cfs_time_after(ocapa->c_expiry, tmp->c_expiry)) {
- next = &tmp->u.cli.lli_list;
- break;
- }
- }
- LASSERT(&ocapa->u.cli.lli_list != next);
- list_move_tail(&ocapa->u.cli.lli_list, next ?: &lli->lli_oss_capas);
-}
-
-static struct obd_capa *do_add_oss_capa(struct inode *inode,
- struct obd_capa *ocapa)
-{
- struct obd_capa *old;
- struct lustre_capa *capa = &ocapa->c_capa;
-
- LASSERTF(S_ISREG(inode->i_mode),
- "inode has oss capa, but not regular file, mode: %d\n",
- inode->i_mode);
-
- /* FIXME: can't replace it so easily with fine-grained opc */
- old = do_lookup_oss_capa(inode, capa_opc(capa) & CAPA_OPC_OSS_ONLY);
- if (!old) {
- ocapa->u.cli.inode = inode;
- INIT_LIST_HEAD(&ocapa->u.cli.lli_list);
- capa_count[CAPA_SITE_CLIENT]++;
-
- DEBUG_CAPA(D_SEC, capa, "add OSS");
- } else {
- spin_lock(&old->c_lock);
- old->c_capa = *capa;
- spin_unlock(&old->c_lock);
-
- DEBUG_CAPA(D_SEC, capa, "update OSS");
-
- capa_put(ocapa);
- ocapa = old;
- }
-
- inode_add_oss_capa(inode, ocapa);
- return ocapa;
-}
-
-struct obd_capa *ll_add_capa(struct inode *inode, struct obd_capa *ocapa)
-{
- spin_lock(&capa_lock);
- ocapa = capa_for_mds(&ocapa->c_capa) ? do_add_mds_capa(inode, ocapa) :
- do_add_oss_capa(inode, ocapa);
-
- /* truncate capa won't renew */
- if (ocapa->c_capa.lc_opc != CAPA_OPC_OSS_TRUNC) {
- set_capa_expiry(ocapa);
- list_del_init(&ocapa->c_list);
- sort_add_capa(ocapa, ll_capa_list);
-
- update_capa_timer(ocapa, capa_renewal_time(ocapa));
- }
-
- spin_unlock(&capa_lock);
-
- atomic_set(&ll_capa_debug, 1);
- return ocapa;
-}
-
-static inline void delay_capa_renew(struct obd_capa *oc, cfs_time_t delay)
-{
- /* NB: set a fake expiry for this capa to prevent it renew too soon */
- oc->c_expiry = cfs_time_add(oc->c_expiry, cfs_time_seconds(delay));
-}
-
-static int ll_update_capa(struct obd_capa *ocapa, struct lustre_capa *capa)
-{
- struct inode *inode = ocapa->u.cli.inode;
- int rc = 0;
- ENTRY;
-
- LASSERT(ocapa);
-
- if (IS_ERR(capa)) {
- /* set error code */
- rc = PTR_ERR(capa);
- spin_lock(&capa_lock);
- if (rc == -ENOENT) {
- DEBUG_CAPA(D_SEC, &ocapa->c_capa,
- "renewal canceled because object removed");
- ll_capa_renewal_noent++;
- } else {
- ll_capa_renewal_failed++;
-
- /* failed capa won't be renewed any longer, but if -EIO,
- * client might be doing recovery, retry in 2 min. */
- if (rc == -EIO && !capa_is_expired(ocapa)) {
- delay_capa_renew(ocapa, 120);
- DEBUG_CAPA(D_ERROR, &ocapa->c_capa,
- "renewal failed: -EIO, "
- "retry in 2 mins");
- ll_capa_renewal_retries++;
- GOTO(retry, rc);
- } else {
- DEBUG_CAPA(D_ERROR, &ocapa->c_capa,
- "renewal failed(rc: %d) for", rc);
- }
- }
-
- list_del_init(&ocapa->c_list);
- sort_add_capa(ocapa, &ll_idle_capas);
- spin_unlock(&capa_lock);
-
- capa_put(ocapa);
- iput(inode);
- RETURN(rc);
- }
-
- spin_lock(&ocapa->c_lock);
- LASSERT(!memcmp(&ocapa->c_capa, capa,
- offsetof(struct lustre_capa, lc_opc)));
- ocapa->c_capa = *capa;
- set_capa_expiry(ocapa);
- spin_unlock(&ocapa->c_lock);
-
- spin_lock(&capa_lock);
- if (capa_for_oss(capa))
- inode_add_oss_capa(inode, ocapa);
- DEBUG_CAPA(D_SEC, capa, "renew");
- EXIT;
-retry:
- list_del_init(&ocapa->c_list);
- sort_add_capa(ocapa, ll_capa_list);
- update_capa_timer(ocapa, capa_renewal_time(ocapa));
- spin_unlock(&capa_lock);
-
- capa_put(ocapa);
- iput(inode);
- return rc;
-}
-
-void ll_capa_open(struct inode *inode)
-{
- struct ll_inode_info *lli = ll_i2info(inode);
-
- if ((ll_i2sbi(inode)->ll_flags & (LL_SBI_MDS_CAPA | LL_SBI_OSS_CAPA))
- == 0)
- return;
-
- if (!S_ISREG(inode->i_mode))
- return;
-
- atomic_inc(&lli->lli_open_count);
-}
-
-void ll_capa_close(struct inode *inode)
-{
- struct ll_inode_info *lli = ll_i2info(inode);
-
- if ((ll_i2sbi(inode)->ll_flags & (LL_SBI_MDS_CAPA | LL_SBI_OSS_CAPA))
- == 0)
- return;
-
- if (!S_ISREG(inode->i_mode))
- return;
-
- atomic_dec(&lli->lli_open_count);
-}
-
-/* delete CAPA_OPC_OSS_TRUNC only */
-void ll_truncate_free_capa(struct obd_capa *ocapa)
-{
- if (!ocapa)
- return;
-
- LASSERT(ocapa->c_capa.lc_opc & CAPA_OPC_OSS_TRUNC);
- DEBUG_CAPA(D_SEC, &ocapa->c_capa, "free truncate");
-
- /* release ref when find */
- capa_put(ocapa);
- if (likely(ocapa->c_capa.lc_opc == CAPA_OPC_OSS_TRUNC)) {
- spin_lock(&capa_lock);
- ll_delete_capa(ocapa);
- spin_unlock(&capa_lock);
- }
-}
-
-void ll_clear_inode_capas(struct inode *inode)
-{
- struct ll_inode_info *lli = ll_i2info(inode);
- struct obd_capa *ocapa, *tmp;
-
- spin_lock(&capa_lock);
- ocapa = lli->lli_mds_capa;
- if (ocapa)
- ll_delete_capa(ocapa);
-
- list_for_each_entry_safe(ocapa, tmp, &lli->lli_oss_capas,
- u.cli.lli_list)
- ll_delete_capa(ocapa);
- spin_unlock(&capa_lock);
-}
-
-void ll_print_capa_stat(struct ll_sb_info *sbi)
-{
- if (sbi->ll_flags & (LL_SBI_MDS_CAPA | LL_SBI_OSS_CAPA))
- LCONSOLE_INFO("Fid capabilities renewed: %llu\n"
- "Fid capabilities renewal ENOENT: %llu\n"
- "Fid capabilities failed to renew: %llu\n"
- "Fid capabilities renewal retries: %llu\n",
- ll_capa_renewed, ll_capa_renewal_noent,
- ll_capa_renewal_failed, ll_capa_renewal_retries);
-}
git://git.whamcloud.com / fs / lustre-release.git / commitdiff