diff options
Diffstat (limited to 'drivers/staging/lustre/include/linux/libcfs/lucache.h')
| -rw-r--r-- | drivers/staging/lustre/include/linux/libcfs/lucache.h | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/drivers/staging/lustre/include/linux/libcfs/lucache.h b/drivers/staging/lustre/include/linux/libcfs/lucache.h new file mode 100644 index 000000000000..7ae36fc88d77 --- /dev/null +++ b/drivers/staging/lustre/include/linux/libcfs/lucache.h @@ -0,0 +1,162 @@ +/* + * 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 <linux/libcfs/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; + group_info_t *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; + cfs_time_t ue_acquire_expire; + cfs_time_t 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 */ |