/* * 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.gnu.org/licenses/gpl-2.0.html * * GPL HEADER END */ /* * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. * Use is subject to license terms. * * Copyright (c) 2012, 2015, Intel Corporation. */ /* * This file is part of Lustre, http://www.lustre.org/ * Lustre is a trademark of Sun Microsystems, Inc. * * lustre/fld/fld_internal.h * * Subsystem Description: * FLD is FID Location Database, which stores where (IE, on which MDT) * FIDs are located. * The database is basically a record file, each record consists of a FID * sequence range, MDT/OST index, and flags. The FLD for the whole FS * is only stored on the sequence controller(MDT0) right now, but each target * also has its local FLD, which only stores the local sequence. * * The FLD subsystem usually has two tasks: * 1. maintain the database, i.e. when the sequence controller allocates * new sequence ranges to some nodes, it will call the FLD API to insert the * location information in FLDB. * * 2. Handle requests from other nodes, i.e. if client needs to know where * the FID is located, if it can not find the information in the local cache, * it will send a FLD lookup RPC to the FLD service, and the FLD service will * look up the FLDB entry and return the location information to client. * * Author: Yury Umanets * Author: Tom WangDi */ #ifndef __FLD_INTERNAL_H #define __FLD_INTERNAL_H #include #include #include struct fld_stats { __u64 fst_count; __u64 fst_cache; }; typedef int (*fld_hash_func_t) (struct lu_client_fld *, __u64); typedef struct lu_fld_target * (*fld_scan_func_t) (struct lu_client_fld *, __u64); struct lu_fld_hash { const char *fh_name; fld_hash_func_t fh_hash_func; fld_scan_func_t fh_scan_func; }; struct fld_cache_entry { struct list_head fce_lru; struct list_head fce_list; /** * fld cache entries are sorted on range->lsr_start field. */ struct lu_seq_range fce_range; }; struct fld_cache { /** * Cache guard, protects fci_hash mostly because others immutable after * init is finished. */ rwlock_t fci_lock; /** * Cache shrink threshold */ int fci_threshold; /** * Prefered number of cached entries */ int fci_cache_size; /** * Current number of cached entries. Protected by \a fci_lock */ int fci_cache_count; /** * LRU list fld entries. */ struct list_head fci_lru; /** * sorted fld entries. */ struct list_head fci_entries_head; /** * Cache statistics. */ struct fld_stats fci_stat; /** * Cache name used for debug and messages. */ char fci_name[80]; }; enum { /* 4M of FLD cache will not hurt client a lot. */ FLD_SERVER_CACHE_SIZE = (4 * 0x100000), /* 1M of FLD cache will not hurt client a lot. */ FLD_CLIENT_CACHE_SIZE = (1 * 0x100000) }; enum { /* Cache threshold is 10 percent of size. */ FLD_SERVER_CACHE_THRESHOLD = 10, /* Cache threshold is 10 percent of size. */ FLD_CLIENT_CACHE_THRESHOLD = 10 }; extern struct lu_fld_hash fld_hash[]; # ifdef HAVE_SERVER_SUPPORT struct fld_thread_info { struct lu_seq_range fti_rec; struct lu_seq_range fti_lrange; struct lu_seq_range fti_irange; }; extern struct lu_context_key fld_thread_key; struct dt_device; int fld_index_init(const struct lu_env *env, struct lu_server_fld *fld, struct dt_device *dt, int type); void fld_index_fini(const struct lu_env *env, struct lu_server_fld *fld); int fld_declare_index_create(const struct lu_env *env, struct lu_server_fld *fld, const struct lu_seq_range *new_range, struct thandle *th); int fld_index_create(const struct lu_env *env, struct lu_server_fld *fld, const struct lu_seq_range *new_range, struct thandle *th); int fld_index_lookup(const struct lu_env *env, struct lu_server_fld *fld, u64 seq, struct lu_seq_range *range); int fld_name_to_index(const char *name, __u32 *index); int fld_server_mod_init(void); void fld_server_mod_exit(void); int fld_server_read(const struct lu_env *env, struct lu_server_fld *fld, struct lu_seq_range *range, void *data, int data_len); extern const struct file_operations fld_debugfs_seq_fops; extern struct dentry *fld_debugfs_dir; # endif /* HAVE_SERVER_SUPPORT */ int fld_client_rpc(struct obd_export *exp, struct lu_seq_range *range, __u32 fld_op, struct ptlrpc_request **reqp); extern struct lprocfs_vars fld_client_debugfs_list[]; struct fld_cache *fld_cache_init(const char *name, int cache_size, int cache_threshold); void fld_cache_fini(struct fld_cache *cache); void fld_cache_flush(struct fld_cache *cache); int fld_cache_insert(struct fld_cache *cache, const struct lu_seq_range *range); struct fld_cache_entry *fld_cache_entry_create(const struct lu_seq_range *range); int fld_cache_insert_nolock(struct fld_cache *cache, struct fld_cache_entry *f_new); void fld_cache_delete(struct fld_cache *cache, const struct lu_seq_range *range); void fld_cache_delete_nolock(struct fld_cache *cache, const struct lu_seq_range *range); int fld_cache_lookup(struct fld_cache *cache, const u64 seq, struct lu_seq_range *range); struct fld_cache_entry * fld_cache_entry_lookup(struct fld_cache *cache, const struct lu_seq_range *range); void fld_cache_entry_delete(struct fld_cache *cache, struct fld_cache_entry *node); struct fld_cache_entry * fld_cache_entry_lookup_nolock(struct fld_cache *cache, const struct lu_seq_range *range); static inline const char * fld_target_name(const struct lu_fld_target *tar) { #ifdef HAVE_SERVER_SUPPORT if (tar->ft_srv != NULL) return tar->ft_srv->lsf_name; #endif return tar->ft_exp->exp_obd->obd_name; } #endif /* __FLD_INTERNAL_H */