+++ /dev/null
-/*
- * 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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
- * Use is subject to license terms.
- *
- * Copyright (c) 2012, Intel Corporation.
- */
-/*
- * This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
- */
-
-#ifndef _LUCACHE_H
-#define _LUCACHE_H
-
-#include "libcfs.h"
-
-/** \defgroup ucache ucache
- *
- * @{
- */
-
-#define UC_CACHE_NEW 0x01
-#define UC_CACHE_ACQUIRING 0x02
-#define UC_CACHE_INVALID 0x04
-#define UC_CACHE_EXPIRED 0x08
-
-#define UC_CACHE_IS_NEW(i) ((i)->ue_flags & UC_CACHE_NEW)
-#define UC_CACHE_IS_INVALID(i) ((i)->ue_flags & UC_CACHE_INVALID)
-#define UC_CACHE_IS_ACQUIRING(i) ((i)->ue_flags & UC_CACHE_ACQUIRING)
-#define UC_CACHE_IS_EXPIRED(i) ((i)->ue_flags & UC_CACHE_EXPIRED)
-#define UC_CACHE_IS_VALID(i) ((i)->ue_flags == 0)
-
-#define UC_CACHE_SET_NEW(i) (i)->ue_flags |= UC_CACHE_NEW
-#define UC_CACHE_SET_INVALID(i) (i)->ue_flags |= UC_CACHE_INVALID
-#define UC_CACHE_SET_ACQUIRING(i) (i)->ue_flags |= UC_CACHE_ACQUIRING
-#define UC_CACHE_SET_EXPIRED(i) (i)->ue_flags |= UC_CACHE_EXPIRED
-#define UC_CACHE_SET_VALID(i) (i)->ue_flags = 0
-
-#define UC_CACHE_CLEAR_NEW(i) (i)->ue_flags &= ~UC_CACHE_NEW
-#define UC_CACHE_CLEAR_ACQUIRING(i) (i)->ue_flags &= ~UC_CACHE_ACQUIRING
-#define UC_CACHE_CLEAR_INVALID(i) (i)->ue_flags &= ~UC_CACHE_INVALID
-#define UC_CACHE_CLEAR_EXPIRED(i) (i)->ue_flags &= ~UC_CACHE_EXPIRED
-
-struct upcall_cache_entry;
-
-struct md_perm {
- lnet_nid_t mp_nid;
- __u32 mp_perm;
-};
-
-struct md_identity {
- struct upcall_cache_entry *mi_uc_entry;
- uid_t mi_uid;
- gid_t mi_gid;
- struct group_info *mi_ginfo;
- int mi_nperms;
- struct md_perm *mi_perms;
-};
-
-struct upcall_cache_entry {
- struct list_head ue_hash;
- __u64 ue_key;
- atomic_t ue_refcount;
- int ue_flags;
- wait_queue_head_t ue_waitq;
- unsigned long ue_acquire_expire;
- unsigned long ue_expire;
- union {
- struct md_identity identity;
- } u;
-};
-
-#define UC_CACHE_HASH_SIZE (128)
-#define UC_CACHE_HASH_INDEX(id) ((id) & (UC_CACHE_HASH_SIZE - 1))
-#define UC_CACHE_UPCALL_MAXPATH (1024UL)
-
-struct upcall_cache;
-
-struct upcall_cache_ops {
- void (*init_entry)(struct upcall_cache_entry *, void *args);
- void (*free_entry)(struct upcall_cache *,
- struct upcall_cache_entry *);
- int (*upcall_compare)(struct upcall_cache *,
- struct upcall_cache_entry *,
- __u64 key, void *args);
- int (*downcall_compare)(struct upcall_cache *,
- struct upcall_cache_entry *,
- __u64 key, void *args);
- int (*do_upcall)(struct upcall_cache *,
- struct upcall_cache_entry *);
- int (*parse_downcall)(struct upcall_cache *,
- struct upcall_cache_entry *, void *);
-};
-
-struct upcall_cache {
- struct list_head uc_hashtable[UC_CACHE_HASH_SIZE];
- spinlock_t uc_lock;
- rwlock_t uc_upcall_rwlock;
-
- char uc_name[40]; /* for upcall */
- char uc_upcall[UC_CACHE_UPCALL_MAXPATH];
- int uc_acquire_expire; /* seconds */
- int uc_entry_expire; /* seconds */
- struct upcall_cache_ops *uc_ops;
-};
-
-struct upcall_cache_entry *upcall_cache_get_entry(struct upcall_cache *cache,
- __u64 key, void *args);
-void upcall_cache_put_entry(struct upcall_cache *cache,
- struct upcall_cache_entry *entry);
-int upcall_cache_downcall(struct upcall_cache *cache, __u32 err, __u64 key,
- void *args);
-void upcall_cache_flush_idle(struct upcall_cache *cache);
-void upcall_cache_flush_all(struct upcall_cache *cache);
-void upcall_cache_flush_one(struct upcall_cache *cache, __u64 key, void *args);
-struct upcall_cache *upcall_cache_init(const char *name, const char *upcall,
- struct upcall_cache_ops *ops);
-void upcall_cache_cleanup(struct upcall_cache *cache);
-
-#if 0
-struct upcall_cache_entry *upcall_cache_get_entry(struct upcall_cache *hash,
- __u64 key, __u32 primary,
- __u32 ngroups, __u32 *groups);
-void upcall_cache_put_entry(struct upcall_cache *hash,
- struct upcall_cache_entry *entry);
-int upcall_cache_downcall(struct upcall_cache *hash, __u32 err, __u64 key,
- __u32 primary, __u32 ngroups, __u32 *groups);
-void upcall_cache_flush_idle(struct upcall_cache *cache);
-void upcall_cache_flush_all(struct upcall_cache *cache);
-struct upcall_cache *upcall_cache_init(const char *name);
-void upcall_cache_cleanup(struct upcall_cache *hash);
-
-#endif
-
-/** @} ucache */
-
-#endif /* _LUCACHE_H */
+++ /dev/null
-/*
- * 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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
- * Use is subject to license terms.
- *
- * Copyright (c) 2012, Intel Corporation.
- */
-/*
- * This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
- *
- * libcfs/libcfs/upcall_cache.c
- *
- * Supplementary groups cache.
- */
-#define DEBUG_SUBSYSTEM S_SEC
-
-#include "../../include/linux/libcfs/lucache.h"
-
-static struct upcall_cache_entry *alloc_entry(struct upcall_cache *cache,
- __u64 key, void *args)
-{
- struct upcall_cache_entry *entry;
-
- LIBCFS_ALLOC(entry, sizeof(*entry));
- if (!entry)
- return NULL;
-
- UC_CACHE_SET_NEW(entry);
- INIT_LIST_HEAD(&entry->ue_hash);
- entry->ue_key = key;
- atomic_set(&entry->ue_refcount, 0);
- init_waitqueue_head(&entry->ue_waitq);
- if (cache->uc_ops->init_entry)
- cache->uc_ops->init_entry(entry, args);
- return entry;
-}
-
-/* protected by cache lock */
-static void free_entry(struct upcall_cache *cache,
- struct upcall_cache_entry *entry)
-{
- if (cache->uc_ops->free_entry)
- cache->uc_ops->free_entry(cache, entry);
-
- list_del(&entry->ue_hash);
- CDEBUG(D_OTHER, "destroy cache entry %p for key %llu\n",
- entry, entry->ue_key);
- LIBCFS_FREE(entry, sizeof(*entry));
-}
-
-static inline int upcall_compare(struct upcall_cache *cache,
- struct upcall_cache_entry *entry,
- __u64 key, void *args)
-{
- if (entry->ue_key != key)
- return -1;
-
- if (cache->uc_ops->upcall_compare)
- return cache->uc_ops->upcall_compare(cache, entry, key, args);
-
- return 0;
-}
-
-static inline int downcall_compare(struct upcall_cache *cache,
- struct upcall_cache_entry *entry,
- __u64 key, void *args)
-{
- if (entry->ue_key != key)
- return -1;
-
- if (cache->uc_ops->downcall_compare)
- return cache->uc_ops->downcall_compare(cache, entry, key, args);
-
- return 0;
-}
-
-static inline void get_entry(struct upcall_cache_entry *entry)
-{
- atomic_inc(&entry->ue_refcount);
-}
-
-static inline void put_entry(struct upcall_cache *cache,
- struct upcall_cache_entry *entry)
-{
- if (atomic_dec_and_test(&entry->ue_refcount) &&
- (UC_CACHE_IS_INVALID(entry) || UC_CACHE_IS_EXPIRED(entry))) {
- free_entry(cache, entry);
- }
-}
-
-static int check_unlink_entry(struct upcall_cache *cache,
- struct upcall_cache_entry *entry)
-{
- if (UC_CACHE_IS_VALID(entry) &&
- time_before(cfs_time_current(), entry->ue_expire))
- return 0;
-
- if (UC_CACHE_IS_ACQUIRING(entry)) {
- if (entry->ue_acquire_expire == 0 ||
- time_before(cfs_time_current(), entry->ue_acquire_expire))
- return 0;
-
- UC_CACHE_SET_EXPIRED(entry);
- wake_up_all(&entry->ue_waitq);
- } else if (!UC_CACHE_IS_INVALID(entry)) {
- UC_CACHE_SET_EXPIRED(entry);
- }
-
- list_del_init(&entry->ue_hash);
- if (!atomic_read(&entry->ue_refcount))
- free_entry(cache, entry);
- return 1;
-}
-
-static inline int refresh_entry(struct upcall_cache *cache,
- struct upcall_cache_entry *entry)
-{
- LASSERT(cache->uc_ops->do_upcall);
- return cache->uc_ops->do_upcall(cache, entry);
-}
-
-struct upcall_cache_entry *upcall_cache_get_entry(struct upcall_cache *cache,
- __u64 key, void *args)
-{
- struct upcall_cache_entry *entry = NULL, *new = NULL, *next;
- struct list_head *head;
- wait_queue_t wait;
- int rc, found;
-
- LASSERT(cache);
-
- head = &cache->uc_hashtable[UC_CACHE_HASH_INDEX(key)];
-find_again:
- found = 0;
- spin_lock(&cache->uc_lock);
- list_for_each_entry_safe(entry, next, head, ue_hash) {
- /* check invalid & expired items */
- if (check_unlink_entry(cache, entry))
- continue;
- if (upcall_compare(cache, entry, key, args) == 0) {
- found = 1;
- break;
- }
- }
-
- if (!found) {
- if (!new) {
- spin_unlock(&cache->uc_lock);
- new = alloc_entry(cache, key, args);
- if (!new) {
- CERROR("fail to alloc entry\n");
- return ERR_PTR(-ENOMEM);
- }
- goto find_again;
- } else {
- list_add(&new->ue_hash, head);
- entry = new;
- }
- } else {
- if (new) {
- free_entry(cache, new);
- new = NULL;
- }
- list_move(&entry->ue_hash, head);
- }
- get_entry(entry);
-
- /* acquire for new one */
- if (UC_CACHE_IS_NEW(entry)) {
- UC_CACHE_SET_ACQUIRING(entry);
- UC_CACHE_CLEAR_NEW(entry);
- spin_unlock(&cache->uc_lock);
- rc = refresh_entry(cache, entry);
- spin_lock(&cache->uc_lock);
- entry->ue_acquire_expire =
- cfs_time_shift(cache->uc_acquire_expire);
- if (rc < 0) {
- UC_CACHE_CLEAR_ACQUIRING(entry);
- UC_CACHE_SET_INVALID(entry);
- wake_up_all(&entry->ue_waitq);
- if (unlikely(rc == -EREMCHG)) {
- put_entry(cache, entry);
- entry = ERR_PTR(rc);
- goto out;
- }
- }
- }
- /* someone (and only one) is doing upcall upon this item,
- * wait it to complete */
- if (UC_CACHE_IS_ACQUIRING(entry)) {
- long expiry = (entry == new) ?
- cfs_time_seconds(cache->uc_acquire_expire) :
- MAX_SCHEDULE_TIMEOUT;
- long left;
-
- init_waitqueue_entry(&wait, current);
- add_wait_queue(&entry->ue_waitq, &wait);
- set_current_state(TASK_INTERRUPTIBLE);
- spin_unlock(&cache->uc_lock);
-
- left = schedule_timeout(expiry);
-
- spin_lock(&cache->uc_lock);
- remove_wait_queue(&entry->ue_waitq, &wait);
- if (UC_CACHE_IS_ACQUIRING(entry)) {
- /* we're interrupted or upcall failed in the middle */
- rc = left > 0 ? -EINTR : -ETIMEDOUT;
- CERROR("acquire for key %llu: error %d\n",
- entry->ue_key, rc);
- put_entry(cache, entry);
- entry = ERR_PTR(rc);
- goto out;
- }
- }
-
- /* invalid means error, don't need to try again */
- if (UC_CACHE_IS_INVALID(entry)) {
- put_entry(cache, entry);
- entry = ERR_PTR(-EIDRM);
- goto out;
- }
-
- /* check expired
- * We can't refresh the existing one because some
- * memory might be shared by multiple processes.
- */
- if (check_unlink_entry(cache, entry)) {
- /* if expired, try again. but if this entry is
- * created by me but too quickly turn to expired
- * without any error, should at least give a
- * chance to use it once.
- */
- if (entry != new) {
- put_entry(cache, entry);
- spin_unlock(&cache->uc_lock);
- new = NULL;
- goto find_again;
- }
- }
-
- /* Now we know it's good */
-out:
- spin_unlock(&cache->uc_lock);
- return entry;
-}
-EXPORT_SYMBOL(upcall_cache_get_entry);
-
-void upcall_cache_put_entry(struct upcall_cache *cache,
- struct upcall_cache_entry *entry)
-{
- if (!entry) {
- return;
- }
-
- LASSERT(atomic_read(&entry->ue_refcount) > 0);
- spin_lock(&cache->uc_lock);
- put_entry(cache, entry);
- spin_unlock(&cache->uc_lock);
-}
-EXPORT_SYMBOL(upcall_cache_put_entry);
-
-int upcall_cache_downcall(struct upcall_cache *cache, __u32 err, __u64 key,
- void *args)
-{
- struct upcall_cache_entry *entry = NULL;
- struct list_head *head;
- int found = 0, rc = 0;
-
- LASSERT(cache);
-
- head = &cache->uc_hashtable[UC_CACHE_HASH_INDEX(key)];
-
- spin_lock(&cache->uc_lock);
- list_for_each_entry(entry, head, ue_hash) {
- if (downcall_compare(cache, entry, key, args) == 0) {
- found = 1;
- get_entry(entry);
- break;
- }
- }
-
- if (!found) {
- CDEBUG(D_OTHER, "%s: upcall for key %llu not expected\n",
- cache->uc_name, key);
- /* haven't found, it's possible */
- spin_unlock(&cache->uc_lock);
- return -EINVAL;
- }
-
- if (err) {
- CDEBUG(D_OTHER, "%s: upcall for key %llu returned %d\n",
- cache->uc_name, entry->ue_key, err);
- rc = -EINVAL;
- goto out;
- }
-
- if (!UC_CACHE_IS_ACQUIRING(entry)) {
- CDEBUG(D_RPCTRACE, "%s: found uptodate entry %p (key %llu)\n",
- cache->uc_name, entry, entry->ue_key);
- rc = 0;
- goto out;
- }
-
- if (UC_CACHE_IS_INVALID(entry) || UC_CACHE_IS_EXPIRED(entry)) {
- CERROR("%s: found a stale entry %p (key %llu) in ioctl\n",
- cache->uc_name, entry, entry->ue_key);
- rc = -EINVAL;
- goto out;
- }
-
- spin_unlock(&cache->uc_lock);
- if (cache->uc_ops->parse_downcall)
- rc = cache->uc_ops->parse_downcall(cache, entry, args);
- spin_lock(&cache->uc_lock);
- if (rc)
- goto out;
-
- entry->ue_expire = cfs_time_shift(cache->uc_entry_expire);
- UC_CACHE_SET_VALID(entry);
- CDEBUG(D_OTHER, "%s: created upcall cache entry %p for key %llu\n",
- cache->uc_name, entry, entry->ue_key);
-out:
- if (rc) {
- UC_CACHE_SET_INVALID(entry);
- list_del_init(&entry->ue_hash);
- }
- UC_CACHE_CLEAR_ACQUIRING(entry);
- spin_unlock(&cache->uc_lock);
- wake_up_all(&entry->ue_waitq);
- put_entry(cache, entry);
-
- return rc;
-}
-EXPORT_SYMBOL(upcall_cache_downcall);
-
-static void cache_flush(struct upcall_cache *cache, int force)
-{
- struct upcall_cache_entry *entry, *next;
- int i;
-
- spin_lock(&cache->uc_lock);
- for (i = 0; i < UC_CACHE_HASH_SIZE; i++) {
- list_for_each_entry_safe(entry, next,
- &cache->uc_hashtable[i], ue_hash) {
- if (!force && atomic_read(&entry->ue_refcount)) {
- UC_CACHE_SET_EXPIRED(entry);
- continue;
- }
- LASSERT(!atomic_read(&entry->ue_refcount));
- free_entry(cache, entry);
- }
- }
- spin_unlock(&cache->uc_lock);
-}
-
-void upcall_cache_flush_idle(struct upcall_cache *cache)
-{
- cache_flush(cache, 0);
-}
-EXPORT_SYMBOL(upcall_cache_flush_idle);
-
-void upcall_cache_flush_all(struct upcall_cache *cache)
-{
- cache_flush(cache, 1);
-}
-EXPORT_SYMBOL(upcall_cache_flush_all);
-
-void upcall_cache_flush_one(struct upcall_cache *cache, __u64 key, void *args)
-{
- struct list_head *head;
- struct upcall_cache_entry *entry;
- int found = 0;
-
- head = &cache->uc_hashtable[UC_CACHE_HASH_INDEX(key)];
-
- spin_lock(&cache->uc_lock);
- list_for_each_entry(entry, head, ue_hash) {
- if (upcall_compare(cache, entry, key, args) == 0) {
- found = 1;
- break;
- }
- }
-
- if (found) {
- CWARN("%s: flush entry %p: key %llu, ref %d, fl %x, cur %lu, ex %ld/%ld\n",
- cache->uc_name, entry, entry->ue_key,
- atomic_read(&entry->ue_refcount), entry->ue_flags,
- get_seconds(), entry->ue_acquire_expire,
- entry->ue_expire);
- UC_CACHE_SET_EXPIRED(entry);
- if (!atomic_read(&entry->ue_refcount))
- free_entry(cache, entry);
- }
- spin_unlock(&cache->uc_lock);
-}
-EXPORT_SYMBOL(upcall_cache_flush_one);
-
-struct upcall_cache *upcall_cache_init(const char *name, const char *upcall,
- struct upcall_cache_ops *ops)
-{
- struct upcall_cache *cache;
- int i;
-
- LIBCFS_ALLOC(cache, sizeof(*cache));
- if (!cache)
- return ERR_PTR(-ENOMEM);
-
- spin_lock_init(&cache->uc_lock);
- rwlock_init(&cache->uc_upcall_rwlock);
- for (i = 0; i < UC_CACHE_HASH_SIZE; i++)
- INIT_LIST_HEAD(&cache->uc_hashtable[i]);
- strncpy(cache->uc_name, name, sizeof(cache->uc_name) - 1);
- /* upcall pathname proc tunable */
- strncpy(cache->uc_upcall, upcall, sizeof(cache->uc_upcall) - 1);
- cache->uc_entry_expire = 20 * 60;
- cache->uc_acquire_expire = 30;
- cache->uc_ops = ops;
-
- return cache;
-}
-EXPORT_SYMBOL(upcall_cache_init);
-
-void upcall_cache_cleanup(struct upcall_cache *cache)
-{
- if (!cache)
- return;
- upcall_cache_flush_all(cache);
- LIBCFS_FREE(cache, sizeof(*cache));
-}
-EXPORT_SYMBOL(upcall_cache_cleanup);
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