* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
- * Copyright (c) 2012, 2013, Intel Corporation.
+ * Copyright (c) 2012, 2014, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
*
* 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 <sequence_range, node_index> 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 <umka@clusterfs.com>
* Author: Tom WangDi <wangdi@clusterfs.com>
*/
#ifndef __FLD_INTERNAL_H
#define __FLD_INTERNAL_H
+#include <obd.h>
#include <lustre/lustre_idl.h>
-#include <dt_object.h>
-
#include <libcfs/libcfs.h>
-#include <lustre_req_layout.h>
#include <lustre_fld.h>
-enum {
- LUSTRE_FLD_INIT = 1 << 0,
- LUSTRE_FLD_RUN = 1 << 1
-};
-
struct fld_stats {
__u64 fst_count;
__u64 fst_cache;
- __u64 fst_inflight;
};
typedef int (*fld_hash_func_t) (struct lu_client_fld *, __u64);
};
struct fld_cache_entry {
- cfs_list_t fce_lru;
- cfs_list_t fce_list;
- /**
- * fld cache entries are sorted on range->lsr_start field. */
- struct lu_seq_range fce_range;
+ 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 {
/**
* LRU list fld entries. */
- cfs_list_t fci_lru;
+ struct list_head fci_lru;
/**
* sorted fld entries. */
- cfs_list_t fci_entries_head;
+ struct list_head fci_entries_head;
/**
* Cache statistics. */
unsigned int fci_no_shrink:1;
};
-enum fld_op {
- FLD_CREATE = 0,
- FLD_DELETE = 1,
- FLD_LOOKUP = 2
-};
-
enum {
/* 4M of FLD cache will not hurt client a lot. */
FLD_SERVER_CACHE_SIZE = (4 * 0x100000),
extern struct lu_fld_hash fld_hash[];
-#ifdef __KERNEL__
+#ifdef CONFIG_PROC_FS
+extern struct proc_dir_entry *fld_type_proc_dir;
+extern struct lprocfs_vars fld_client_proc_list[];
+#endif
+
+# ifdef HAVE_SERVER_SUPPORT
struct fld_thread_info {
- struct req_capsule *fti_pill;
- __u64 fti_key;
- struct lu_seq_range fti_rec;
- struct lu_seq_range fti_lrange;
- struct lu_seq_range fti_irange;
+ 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);
+ 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,
+ 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, struct thandle *th);
+ const struct lu_seq_range *new_range, struct thandle *th);
int fld_index_lookup(const struct lu_env *env, struct lu_server_fld *fld,
- seqno_t seq, struct lu_seq_range *range);
+ u64 seq, struct lu_seq_range *range);
-int fld_client_rpc(struct obd_export *exp,
- struct lu_seq_range *range, __u32 fld_op);
+int fld_name_to_index(const char *name, __u32 *index);
+int fld_server_mod_init(void);
-#ifdef LPROCFS
+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);
+#ifdef CONFIG_PROC_FS
+extern const struct file_operations fld_proc_seq_fops;
extern struct lprocfs_vars fld_server_proc_list[];
-extern struct lprocfs_vars fld_client_proc_list[];
#endif
-#endif
+# endif /* HAVE_SERVER_SUPPORT */
+
+int fld_client_rpc(struct obd_export *exp,
+ struct lu_seq_range *range, __u32 fld_op,
+ struct ptlrpc_request **reqp);
struct fld_cache *fld_cache_init(const char *name,
int cache_size, int cache_threshold);
void fld_cache_delete_nolock(struct fld_cache *cache,
const struct lu_seq_range *range);
int fld_cache_lookup(struct fld_cache *cache,
- const seqno_t seq, struct lu_seq_range *range);
+ 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);
-struct fld_cache_entry*
-fld_cache_entry_lookup(struct fld_cache *cache, struct lu_seq_range *range);
void fld_cache_entry_delete(struct fld_cache *cache,
struct fld_cache_entry *node);
-void fld_dump_cache_entries(struct fld_cache *cache);
-struct fld_cache_entry
-*fld_cache_entry_lookup_nolock(struct fld_cache *cache,
- struct lu_seq_range *range);
-int fld_write_range(const struct lu_env *env, struct dt_object *dt,
- const struct lu_seq_range *range, struct thandle *th);
+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(struct lu_fld_target *tar)
+fld_target_name(const struct lu_fld_target *tar)
{
- if (tar->ft_srv != NULL)
- return tar->ft_srv->lsf_name;
+#ifdef HAVE_SERVER_SUPPORT
+ if (tar->ft_srv != NULL)
+ return tar->ft_srv->lsf_name;
+#endif
- return (const char *)tar->ft_exp->exp_obd->obd_name;
+ return tar->ft_exp->exp_obd->obd_name;
}
-extern cfs_proc_dir_entry_t *fld_type_proc_dir;
-extern struct file_operations fld_proc_seq_fops;
#endif /* __FLD_INTERNAL_H */
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